PT2E-15620

Gas Detector Head
GD-70D Series
GD-70D
GD-70D-NT
GD-70D-EA
GD-70D-DV
GD-70D-LN

Operating ManualContents
1. Outline of the Product..................................................................................................................................... 3
1-1. Preface .................................................................................................................................................... 3
1-2. Purpose of use ........................................................................................................................................ 3
1-3. Definition of DANGER, WARNING, CAUTION and NOTE .................................................................. 4
1-4. Method of confirmation for CE/UKCA marking type ............................................................................... 4
2. Important Notices on Safety ........................................................................................................................... 5
2-1. Danger cases........................................................................................................................................... 5
2-2. Warning cases ......................................................................................................................................... 6
2-3. Precautions .............................................................................................................................................. 7
3. Product Components ...................................................................................................................................... 8
3-1. Main unit and standard accessories ........................................................................................................ 8
3-2. Outline drawing ........................................................................................................................................ 9
3-3. Names and functions for each part ....................................................................................................... 11
3-4. Block diagram ........................................................................................................................................ 20
4. How to Use ................................................................................................................................................... 224-1. Before using the detector ...................................................................................................................... 22
4-2. Precautions for installation sites ............................................................................................................ 22
4-3. Precautions for system designing ......................................................................................................... 24
4-4. How to install ......................................................................................................................................... 26
4-5. How to wire ............................................................................................................................................ 28
4-6. How to tube............................................................................................................................................ 39
5. How to Operate ............................................................................................................................................ 41
5-1. Preparation for start-up ......................................................................................................................... 41
5-2. Basic operating procedures................................................................................................................... 42
5-3. How to activate the detector .................................................................................................................. 43
5-4. Modes .................................................................................................................................................... 44
5-5. Detection mode ..................................................................................................................................... 46
5-6. Alarm test mode ..................................................................................................................................... 46
5-7. User mode ............................................................................................................................................. 47
5-8. How to exit ............................................................................................................................................. 52
6. Operations and Functions ............................................................................................................................ 53
6-1. Gas alarm activation .............................................................................................................................. 53
6-2. Fault alarm activation ............................................................................................................................ 58
6-3. External output operation ...................................................................................................................... 59
6-4. Other functions ...................................................................................................................................... 62
6-5. About LONWORKS (LN specification) .................................................................................................. 65
7. Maintenance ................................................................................................................................................. 69
7-1. Maintenance intervals and items ........................................................................................................... 69
7-2. Regular maintenance mode .................................................................................................................. 72
7-3. Calibration method ................................................................................................................................ 88
7-4. Other adjustments/cleaning method ..................................................................................................... 90
7-5. How to replace parts.............................................................................................................................. 91
8. Storage, Relocation and Disposal ................................................................................................................ 94
8-1. Procedures to store the detector or leave it for a long time .................................................................. 94
8-2. Procedures to relocate the detector or use it again .............................................................................. 94
8-3. Disposal of products .............................................................................................................................. 94
9. Troubleshooting ............................................................................................................................................ 96
10. Product Specifications .............................................................................................................................. 100
10-1. List of specifications .......................................................................................................................... 100
10-2. List of accessories ............................................................................................................................. 104
10-3. Detection principle ............................................................................................................................. 104
11. Definition of Terms .................................................................................................................................... 116

2

1. Outline of the Product1-1. Preface

11.

Outline of the Product1-1. Preface
Thank you for choosing our gas detector head GD-70D Series. Please check that the model number ofthe product you purchased is included in the specifications on this manual.
This manual explains how to use the gas detector and its specifications. It contains information required
for using the detector properly. Not only the first-time users but also the users who have already used the
product must read and understand the operating manual to enhance the knowledge and experience
before using the gas detector head.

1-2. Purpose of use








This is a fixed type gas detector head which detects leak of gases used in semiconductor factories,etc.
The gas detector is a safety unit, not an analyzer or densitometer which performs
quantitative/qualitative analysis/measurement for gases. Please fully understand the features of thedetector before using it, so that it can be used properly.
The detector detects abnormalities in the air caused by presence of gases or other reasons (leak andoxygen deficiency) with the built-in gas sensor unit. The concentrations of detected gases are
displayed on the character LCD.
The built-in pump in the detector draws gas to perform gas detection.
The gas detector head has two-step gas alarm contact and fault alarm contact.
The detector outputs gas concentration in 4 - 20 mA or digital data.
The communication method for each specification is as follows.
GD-70D
GD-70D-NT
GD-70D-EA
GD-70D-DV
GD-70D-LN

4 - 20 mA specification
NT specification
EA specification
DV specification
LN specification

Analog transmission
2-wire type DC power-line communication
Ethernet and analog transmission (4 - 20 mA)
DeviceNet transmission
LONWORKS

31. Outline of the Product1-3.

1-3. Definition of DANGER, WARNING, CAUTION and NOTE

Definition of DANGER, WARNING, CAUTION andNOTE
DANGER

This message indicates that improper handling may cause serious damageon life, health or assets.

WARNING

This message indicates that improper handling may cause serious damage
on health or assets.

CAUTION

This message indicates that improper handling may cause minor damage on
health or assets.

NOTE

This message indicates advice on handling.

1-4. Method of confirmation for CE/UKCA marking type
The CE/UKCA marking is labeled on the detector in case of comply with CE/UKCA mark. Please confirm
the instrument specification before using. Please refer Declaration of Conformity that is at the end of thismanual if you have CE/UKCA marking type.
You can confirm instrument specification to see the CE/UKCA mark as follows.

CE/UKCA Mark

CE/UKCA marking label (Back of front cover)42. Important Notices on Safety

2-1. Danger cases

22.

Important Notices on
Safety2-1. Danger cases
DANGER
This is not an explosion-proof unit. Do not use the unit in place where gas over the lower explosive
limit may exist.

52. Important Notices on Safety

2-2. Warning cases

2-2. Warning cases
WARNING
Power supply
Before turning on the detector, always check that the voltage is properly applied. Do not use an
unstable power supply because it may cause malfunctions.
Need of grounding circuit
Do not cut the grounding circuit or disconnect the wire from the grounding terminal.
Defects in protective functions
Before starting the detector, check the protective functions for defects. When seeming defects arefound in the protective functions, such as protective grounding, do not start the detector.
External connection
Before connecting the alarm system to a detection target or external control circuit, securely connect
it to a protective grounding circuit.
Tube
The detector is designed to draw gases under the atmospheric pressure. If excessive pressure isapplied to the sampling inlet and outlet (GAS IN, GAS OUT) of the detector, detectable gases may
be leaked from its inside, thus leading to dangers. Be sure that excessive pressure is not applied tothe detector while used. Detected gases must be exhausted from the detected gas exhausting outlet(GAS OUT) on the back of the detector to which an exhaust tube is connected, to a point regarded
as a safe place.
Handling the sensor unit
Do not disassemble the electrochemical type sensor unit (ESU) or galvanic cell type sensor unit
(OSU) because they contain electrolyte. Electrolyte may cause severe skin burns if it contacts skin,while it may cause blindness if its contacts eyes. If electrolyte is adhered on your clothes, that parton your clothes is discolored or its material is decomposed. If contact occurs, rinse the area
immediately with a large quantity of water.
Zero adjustment (fresh air adjustment) in the atmosphere
When zero adjustment (fresh air adjustment for oxygen deficiency alarm specification) is performedin the atmosphere, check the atmosphere for freshness before beginning the adjustment. If
interference gases (other than measuring and base gases) exist, the adjustment cannot be
performed properly, thus leading to dangers when the gas leaks.
Operation in a gas
Do not operate the detector in a place where combustible/explosive gases or vapors are present.
Operating the detector in such an environment will lead to extreme dangers.
Response to a gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based onyour judgment.

6

2. Important Notices on Safety

2-3. Precautions

2-3. Precautions
CAUTION
Do not use a transceiver near the detector.
Radio wave from a transceiver, etc. near the detector or its cables may disturb indication reading. If
a transceiver or other radio wave transmitting device is used, it must be used in a place where it
disturbs nothing.
To restart the detector, wait for five seconds or more before doing it.
Restarting the detector within five seconds may cause errors.
Verify that the reading on the flow rate indicator corresponds to the specified flow rate before using
the detector.
If it does not correspond to the specified flow rate, gas detection cannot be performed properly.
Check whether the flow rate is unstable or lost.
Attach the dust filter before using the detector.
Before using the detector, attach the specified filter to prevent disturbances by possible gas
adsorption or air dust.
A dust filter to be used varies depending on the gas to be detected. For more information on dust
filters, please contact RIKEN KEIKI.
Observe the operating restrictions to prevent condensation inside the tube.
Condensation formed inside the tube causes clogging or gas adsorption, which may disturb accurate
gas detection. Thus, condensation must be avoided. In addition to the installation environment,
carefully monitor the temperature/humidity of the sampling point to prevent condensation inside thetube. In particular, when detecting a gas which is dissolved into water and corrodes contacted
materials, such as a strong acid gas, the gas is undetectable and furthermore may corrode internal
parts. Please observe the operating restrictions.
Do not use the external output of the detector to control other units.
This is not a control unit. It is not allowed to use the external output of the detector to control otherunits.
Do not disassemble/modify the detector, or change the settings if not necessary.
Disassembling/modifying the detector will invalidate the warranty of the performance. Changing thesettings without understanding the specifications may cause alarm malfunctions. Please use thedetector properly in accordance with the operating manual.
Never fail to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing to
use the detector without performing maintenance will compromise the sensitivity of the sensor, thus
resulting in inaccurate gas detection.

7

3. Product Components

3-1. Main unit and standard accessories

3
3.

Product Components

3-1. Main unit and standard accessories<Main Unit><Standard Accessories>
Operating manualProtective rubber cap (to be removed when using
the detector)

Dedicated handling lever (for wiring)
Dust filterInterference gas removal filter(to be supplied with sensor units for certain gases)● GD-70D-DV (Main Unit + 70D-DV Unit)<Standard Accessories>
Operating manualProtective rubber cap (to be removed when using
the detector)

Dedicated handling lever (for wiring)
Dust filterInterference gas removal filter(to be supplied with sensor units for certain gases)External connector for 5-pin communication

83. Product Components

3-2. Outline drawing<Pyrolyzer Unit (PLU-70)(Option)>
Pyrolyzer Unit

* This is needed in “pyrolyzer + electrochemical type (ESU)” and “pyrolyzer + pyrolysis-particle type
(SSU)”.
For more information on the pyrolyzer unit (PLU-70), see the separate operating manual.

3-2. Outline drawing● Main Unit

M5 mounting hole
Display

Operating switch

Sensor unit display

GAS OUTGAS IN

Protective cover for power switch

Screw for grounding earth rod

External wire holePower switch
Connector for PLU(Unit: mm)Connector for PoE

9

3. Product Components

3-2. Outline drawing● GD-70D-DV (Main Unit + 70D-DV Unit)
MS lampNS lampDisplay window

Operating switch

Mounting hole for 3-M5

Sensor unit display

Terminal block
DeviceNet communication socket

Power switch

Protective cover for power switch

Screw for grounding
earth rod10

3. Product Components

3-3. Names and functions for each part3-3. Names and functions for each partThe detector consists of the following units.
● Main Unit
Pump unit
Wall-mounted unit

Main unit

Sensor unit

● 70D-DV Unit
70D-DV unit
Base

70D main unit
Terminal plate for power/contact
Terminal plate for DeviceNet

CAUTION
Each unit consists of precision parts. When a unit is detached, be careful not to drop it. Dropping theunit compromises its original performance or causes malfunctions.

11

3. Product Components

3-3. Names and functions for each part

<Detaching and Attaching Main Unit>
Detaching Main Unit
While pushing the sky blue lock lever toward the wall-mounted unit, hold up the main unit.
If you cannot move the main unit, insert a larger flathead screwdriver while pushing the lock lever, and you
can easily detach it as shown below. Do not rotate or move up and down the flathead screwdriver. Simply
insert it into the wall-mounted unit.

Attaching Main Unit
At the position 10 mm above the wall-mounted unit, press the main unit onto the wall-mounted unit. Be
sure to fit both side hooks of the wall-mounted unit in the grooves of the main unit.
Then press down the main unit to fix it. The lock at the bottom of the main unit clicks to fix it properly.
Make sure that the top center of the wall hanger unit is above the main unit as viewed from front.

10mm

Make sure that the topof the wall-mounted
unit is above the mainunit.

The lock clicks.
When pressing the main unit,align the side mark with the hookof the wall hanger unit forsmooth installation.

CAUTION Be careful not to drop the main unit when detaching it. Also, check the secure installation of themain unit after attaching it to the wall-mounted unit. If the main unit is not securely installed, it
might fall, causing an unexpected injury or a damage of the unit.
 Turn the power off before detaching or attaching the main unit.

123. Product Components

3-3. Names and functions for each part

<Detaching and Attaching Sensor Unit>
Push the two buttons at the top of the main unit together to open the front
cover. (Pushing only either one button cannot open the cover, but thenpushing the other can open it.)
* The front cover opens about 90 degrees at first. You can push it down to
180 degrees.

CAUTION
Turn the power off before detaching or attaching
the sensor unit.
Hold the convex parts on both sides of the sensor unit and pull it out.

When attaching the sensor unit to the main unit, thrust it onto themain unit and make sure that the sensor unit is securely fixed,
otherwise it might come off.



After replacing the sensor unit, close the front cover. Be sure tocheck the click of the front cover to fix it properly, otherwise it might
open again.

<Detaching and Attaching Pump Unit>
After detaching the sensor unit, push down to open thepump stopper. Pinch the part labeled "PULL" at the top of
the pump unit, and pull it out.

When attaching the pump unit to the main unit, position the grooves of the pump unit at the rails of themain unit and push the pump unit.
Do not push the center diaphragm. Push the part labeled "PULL". And as the connecting point (flow path)of the pump unit is greased, be sure to check any dust.
"PULL"

GrooveDo not pushhere.

×Connecting point(flow path)

13

Rail

3. Product Components

3-3. Names and functions for each part<70D-DV Unit Installation Procedure>
Loosen two screws at the mounting holes of the 70D-DV unit (about five turns) to detach the base.
If the base cannot be detached easily, insert the flathead screwdriver at the place indicated in the figure
below, and then lift the 70D-DV unit to easily detach the base.

ScrewsUse a screw (3-M5) to mount the base on the wall.
Thread the screw heads on the base through the mounting holes of the 70D-DV unit, slide the basedownward, and tighten the screw (two places).
OppositeSlide downward
3-M5

Thread thescrew heads

Opposite side14

3. Product Components

3-3. Names and functions for each part

<Front Panel and Character LCD>
(1) MODE key(2) TEST/SET key(3) ▲ key(4) ▼ key(8) First alarm lamp
(7) Power lamp

(9) Second alarm lamp(10) Fault lamp(20) Pyrolyzer unit
connection indicator(14) Concentration bar
indicator(15) Alarm setpoint display(12) Concentration value
display(13) Unit display(17) Communication
indicator(16) Flow rate indicator(18) Maintenance display(11) Gas name display(19) Inhibit display(6) Sensor unit nameplate display window(5) Lock lever(1)

MODE key(2)

TEST/SET key

(3)
(4)
(5)
(6)

▲ key
▼ key
Lock lever
Sensor unit nameplate
display window
Power lamp (POWER)First alarm lamp (ALM1)
Second alarm lamp
(ALM2)
Fault lamp (FAULT)

(7)
(8)
(9)
(10)
(11)
(12)
(13)

Gas name display
Concentration value
display
Unit display(14)

Concentration bar indicator(15)

Alarm setpoint display(16)

Flow rate indicator(17)

Communication indicator

Used to enter the maintenance mode.
It is also used to cancel or skip in a specific mode.
Used to enter the test mode.
It is used for value confirmation and so on in a specific mode.
Used to switch screen or change a value (UP).
Used to switch screen or change a value (DOWN).
Lever to lock the main unit. Push it to attach or detach the main unit.
Window to check the nameplate of the sensor unit.
You can identify the currently attached sensor unit.
Power lamp. It lights in green when the power is on.
First alarm lamp. It lights in red when the first alarm is reached.
Second alarm lamp. It lights in red when the second alarm is reached.
Fault lamp. It lights in yellow when an abnormality is detected in thedetector.
Displays a gas name in chemical formula, etc. (e.g. Silane = SIH4)
Displays the gas concentration and so on.
Displays the unit according to the specification. (ppm, ppb,
vol%, %, %LEL)
The detectable range (full scale = FS) is divided into 20 with bars. The
increase in concentration is displayed in proportion to the full scale.
The alarm setpoints (AL1 and AL2) are indicated on the concentration
bar.
Displays the flow rate. The center of the bars means the normal flowrate of 0.5 L/min.
For GD-70D-NT, this indicator is displayed while transmitting data withthe upper unit. (TX, RX).
15

3. Product Components(18)

Maintenance indicator

(19)
(20)

Inhibit indicator
Pyrolyzer unit connection
indicator

3-3. Names and functions for each part
Displayed during the maintenance mode. When this indicator isdisplayed, the alarm contact is disconnected to be disabled.
Displayed when the inhibition (point skip) is set.
Displayed when the dedicated pyrolyzer unit (PLU-70) is connected.

<Wall-mounted Unit>
Mounting hole: A hole for wall-mount.

Terminal plate: A terminal to which a power supply,
signal cables and other external wires are connected(10P).

Lock lever: A lever to lock the main unit.

<How to Use Sensor Unit>
A sensor unit installed in the detector is the same regardless of the detection principle, thus
sensor units are interchangeable.
Each sensor unit has a different color in accordance with the principle as shown below.
How to handle the sensor unit varies depending on its principle.

16

3. Product Components

3-3. Names and functions for each part<70D-DV Unit>
(21)

(22)

(23)

(24)

(21)
(22)
(23)
(24)

MS lampNS lampTerminal plate forpower/contact
Terminal plate for
DeviceNet

Module status indicator lamp. It lights in green at a normal state.
Network status indicator lamp. It lights in green at a normal state.
Connects the power cables for power lines and contact output.
Connects the dedicated DeviceNet cable.

CAUTION The sensor unit must be handled carefully to ensure quality as safety unit. When the sensor unit isstored, a dedicated warehouse and power equipment for the sensor unit are needed. In principal,
the sensor unit must not be detached from the detector when it is handled or stored. We will takecare of your sensor unit.
 Be sure that the sensor unit is not installed improperly.
If a sensor unit of different specification or principle from the one shipped from the manufacturer is
attached, a message will be displayed on the LCD of the detector ("C-02"). If the message isdisplayed, check the specifications of the sensor unit.
 After the sensor unit is replaced, always perform a calibration (zero adjustment and span
adjustment).

17

3. Product Components

Electrochemical
Type
(ESU)

3-3. Names and functions for each part







Do not disassemble the sensor unit because it contains electrolyte. If contact
occurs, rinse the area immediately with a large quantity of water.
The sensor unit identifies the direction. Put the sensor unit in the dedicated casewhile handling it. Do not place it on its side or upside-down.
When a new sensor unit is installed, it must be warmed up.
Although warm-up time is different depending on the type of the installed
sensor, it is recommended that warm-up should be performed for three hours or
more. Please contact RIKEN KEIKI for more information.
The sensor unit must be stored in a clean, cool and dark place away from direct
sunlight. Some types of the sensor units cannot be stored together with otherunits. Please contact RIKEN KEIKI for more information.

Dedicated casePyrolysis-Particle
Type(SSU-1925/
SSU-1925A)









Although the sensor unit contains radioactive materials, it is certified as a
specified designing certification device, which is regarded as a device having noinfluences on health. Observe the “Safety Manual” which stipulates conditions
for the certification. To dispose of the sensor unit, you must return it to us. You
do not need to take any additional actions.
The sensor unit contains a small amount of radioactive materials. Do notdisassemble it, or dispose of it like other wastes.
The sensor unit must be put into the dedicated case specified by us, and stored
away from direct sunlight in a clean place where the temperature and humidity
are maintained at a normal level and where appropriate measures are
introduced to prevent it from being taken out easily.
When the sensor unit is transported out of your factory, please use atransportation company which can handle specified designing certification
devices (L-type packages).
For more information, see the “Safety Manual”.

Dedicated casePyrolysis-Particle
Type(SSU-1927)
Overseas only

Although the sensor unit contains radioactive material, the radioactivity is below
10kBq that is determined by IAEA (radiation safe level). So the sensor unit iscapable of handling as a general transport product.
The sensor unit must be put into the dedicated case specified by us, and stored
away from direct sunlight in a clean place where the temperature and humidity
are maintained at a normal level.

18

3. Product Components

3-3. Names and functions for each part

New Ceramic Type
(NCU)




Before using this sensor unit, it must be warmed up for two hours or more.
The sensor unit must be stored under normal temperature/humidity in a clean
place away from direct sunlight.

Semiconductor Type
(SGU)



Before using the sensor unit, it needs to be warmed up for a specified time. The
sensor unit is warmed up sufficiently in our factory before it is delivered to you.
Therefore, after you receive the sensor unit, please use it as soon as possible
so that unpowered time is minimized.
The warm-up (powered) time before using the sensor unit is related to theunpowered time.
Expected powered time
Unpowered time
SGU-8541 (H2)
SGU (Others)
SHU-8644(H2)
10 minutes or
10 minutes or
2 hours or more
less
more
1 hours or less30 minutes or
2 hours or more
more
24 hours or less1 hours or more
4 hours or more
72 hours or less4 hours or more
24 hours or more
10 days or less2 days or more
2 days or more
Less than 1
7 days or more
7 days or moremonthLess than 3
14 days or more
14 days or moremonths3 months or more
1 month or more
1 month or moreHot-wiresemiconductor Type(SHU)

Galvanic Cell Type
(OSU)



To store the sensor unit under unpowered state, it must be stored under normal
temperature/humidity in a clean place away from direct sunlight.



Do not disassemble the sensor unit because it contains electrolyte. If contact
occurs, rinse the area immediately with a large quantity of water.
The sensor unit must be stored under normal temperature/humidity in a clean
place away from direct sunlight.



NDIR(NonDispersive Infrared
Absorption) Type
(IRU)






Before using this sensor unit, it must be warmed up for ten minutes.
The indicated value of this sensor unit varies depending on the pressure in themeasurement environment. Be careful when using.
The sensor unit interferes with CO2.
The sensor unit must be stored under normal temperature/humidity in a clean
place away from direct sunlight.

19

3. Product Components

3-4. Block diagram

3-4. Block diagram<Electric Diagram>
Sensor unit
AmplifierController(CPU)Power supply part
POWER INPUT (24 VDC)

Display(POWER) (ALM1) (ALM2) (FAULT)

Alarm contact controller
Gas alarm contact (ALM1,
ALM2)
Fault alarm contact(FAULT)* Standard setting ofcontact activation
De-energized(De-energized at a
normal state)ON-ALARM(Closed contact at
an alarm state)

Controller
(CPU)

LCD
Operating unit
(MODE) (▲) (▼) (TEST/SET)

Pump
control
circuitTransmitter(4 - 20 mA/NT/
EA specification)
4 - 20 mA specification: 4 - 20mA DC transmission
NT specification: Digital datatransmission
EA specification: Ethernet
and 4-20 mA DC
transmission
LN specification: confirm to
LONWORKSTransmitter(DV specification)
DeviceNet compliant

20

Pump
Flow
sensor3. Product Components

3-4. Block diagram<Tubing Diagram>21

4. How to Use

4-1. Before using the detector

44.

How to Use

4-1. Before using the detector
Not only the first-time users but also the users who have already used the detector must follow theoperating precautions.
Ignoring the precautions may damage the detector, resulting in inaccurate gas detection.

CAUTION
After you received the detector, start using the detector within the specified operation start limit of
the sensor unit.

4-2. Precautions for installation sites
CAUTION
This is a precision device. Because the detector may not provide the specified performance in someplaces (environments), check the environment in the installation site, and then take appropriate
actions if necessary.
Because the detector plays an important role for safety and disaster prevention, you must install as
many units of the detector as needed in appropriate points.Because points where gases leak andremain easily are different depending on the types of gases and the working areas, please decidecarefully installation sites and the number of units to be installed.

22

4. How to Use

4-2. Precautions for installation sites

Do not install the detector in a place with vibrations or shocks.
The detector consists of sensitive electronic parts. The detector must be
installed in a stable place without vibrations or shocks and it cannot drop.

Do not install the detector in a place exposed to water, oil or chemicals.
When selecting installation points, avoid a place where the detector is
exposed to water, oil or chemicals.

Do not install the detector in a place where the temperature drops below
0ºC or rises over 40ºC.
The operating temperature of the detector is 0 to 40ºC. The detector must
be installed in a stable place where the operating temperatures aremaintained and do not change suddenly.
Do not install the detector in a place exposed to direct sunlight or suddenchanges in the temperature.
Avoid a place where the detector is exposed to direct sunlight or radiantheat (infrared rays emitted from a high-temperature object), and where
the unit temperature changes suddenly. Condensation may be formed
inside the detector, or the monitor cannot adjust to sudden changes in thetemperature.

Keep the detector (and its cables) away from noise source devices.
When selecting installation points, avoid a place where highfrequency/high-voltage devices exist.

Do not install the detector in a place where maintenance of the detector cannot be performed or wherehandling the detector involves dangers.
Regular maintenance of the detector must be performed.
Do not install the detector in a place where the machinery must be stopped when maintenance isperformed in its inside, where parts of the machinery must be removed to perform maintenance, orwhere the detector cannot be removed because tubes or racks prevent access to it. Do not install thedetector in a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the detector in machinery which is not properly grounded.
Before installing the detector in machinery, the machinery must be grounded properly.
Do not install the detector in a place where interference gases exist around it.
The detector must not be installed in a place where interference gases exist around it.

23

4. How to Use

4-3. Precautions for system designing

4-3. Precautions for system designing
CAUTION
An unstable power supply and noise may cause malfunctions or false alarms. The descriptions inthis section and each System Construction Manual must be reflected on the designing of a systemusing the detector.

Using a stable power supply
The external output and alarm contact of the detector may be activated when the power is turned on,when momentary blackout occurs, or when the system is being stabilized. In such cases, use a UPS(uninterruptible power system), or take appropriate actions on the receiving side.
The detector must be provided with the following power supply.
Power supply
24 VDC ± 10% (the terminal voltage of the detector) or PoE connection (GDvoltage
70D-EA)
Up to 10 milliseconds
Example of actions
Allowed time of(To recover from the momentary
To ensure continuous operation andmomentary
blackout for 10 milliseconds or more,
activation, install a UPS (uninterruptible
blackout
restart the detector.)
power system), etc. outside the detector.
Do not use it with a power supply of
Example of actions
Otherslarge power load or high-frequency
Use a line filter, etc. to avoid the noise
noise.
source if necessary.
Heat radiation designing
When it is installed in the closed instrumentation panel, attach ventilation fans above and below the panel.
Introducing protective measures against lightning
If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as thecables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as alarge emission source while cables act as a receiving antenna, devices connected to the cables may bedamaged.
Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot becompletely protected from inductive lightning surge caused by lightning. Although complete elimination ofdisasters caused by lightning is impossible, the following protective measures can be taken.
Take appropriate measures in accordance with the importance of the facilities andthe environment.
Connect the transmission signal route by using optical fiber.
ProtectionProvide protection by a lightning arrester (cable safety arrester).
against lightning(Although inductive lightning surge can be transmitted through the cable, it isprevented by installing a lightning arrester before the field devices and central
processing equipment. For information on how to use a lightning arrester, pleasecontact the manufacturer.)
In addition to lightning, there are more sources of surge noise. To protect units from
Groundingthese noise sources, the units must be grounded.
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so thatsignals may be attenuated by installing the arrester. Before installing a lightning arrester, verify that it
works properly.

24

4. How to Use

4-3. Precautions for system designing

Proper use of alarm contact
The alarm contact of the detector is used to transmit signals to activate an external buzzer, alarm lamp or
rotating lamp. Do not use it for controlling purpose (e.g. controlling the shutdown valve).

CAUTION
The "b" contact (break contact) under de-energized state may be opened momentarily by a physicalshock, such as external force.
When the "b" contact is selected for the alarm contact, take appropriate actions to prepare for a
momentary activation, for example, add signal delay operation (approximately one second) to thereceiving side of the "b" contact.
The specifications for the alarm contact of the detector are based on the resistance load conditions. If
inductive load is used at the alarm contact, the following errors will occur easily because counterelectromotive force is generated at the contact.
Deposition, defective insulation or defective contact at the relay contact
Damage of any electric parts due to high-voltage generated inside the detector.

Abnormal operations by an out-of-control CPU

CAUTION In principle, do not activate inductive load at the alarm contact of the detector. (In particular, never
use the inductive load to activate a fluorescent lamp, motor, etc.)
 If inductive load is activated, relay it with an external relay (contact amplification). However,
because the coil of an external relay also involves inductive load, select a relay at a lower voltage(100 VAC or below), and then protect the contact of the detector with an appropriate surge
absorbing part, such as a CR circuit.
If load is to be activated, appropriate measures must be taken to stabilize the operation of the detector
and protect the alarm contact referring to the following information.

Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At thesame time, the surge absorbing part SK1 suitable for the specifications must be attached to theexternal relay.
In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay ifnecessary.
It may be recommended that the surge absorbing part should be attached to the contact for certain
load conditions. It must be attached to an appropriate position by checking how the load is activated.

Coil

Power
supplyAlarm contact

SK2

Power
supplySK1

Load

GD-70D

External relay(low voltage relay)* SK1, SK2: Surge absorbing parts25

4. How to Use

4-4. How to install

4-4. How to install
NOTE
To use the pyrolyzer unit (PLU-70), see also the separate operating manual.

CAUTION
Before installing the detector, remove the protective rubber caps from GAS IN and GAS OUT. If thedetector is turned on with the rubber caps remaining while the installation, applied overload may
damage the pump and sensor. Never fail to remove the caps.

<Installation Dimensions and Maintenance Space of 4 - 20
mA/NT/EA/LN Specification>
Leave the diagonal line area so that the installation space is reserved.
(300)

(90)
(30)

(150)

When installing by using 2 screws

When installing by using 3 screws(Unit: mm)

Maintenance space

Maintenance space

Maintenance space

Maintenance space

Maintenance space

Maintenance space

CAUTION It is recommended that installation points should be away from each other for 10 mm or more.
Intervals between installation points must be at least 5 mm.
 When you install more than one unit of the detector in a line, install them in a rack or wall that are
not influenced by vibrations.
When the power supply units are installed side-by-side, if the rack or wall in which the units are
installed do not have enough strength, vibrations from the pumps inside the units cause resonancebetween them. In this case, take preventive actions, for example, reinforcing the rack or wall.
26

4. How to Use

4-4. How to install

CAUTION
The detector must be installed in the right direction to ensure its performance. Install the detector as
shown on the following example, and adjust its position so that it is placed horizontally. (* The
direction of the detector must also be kept during transportation, including when it is removed
temporarily or relocated.)<Right Installation Direction>

Wall

Ceiling

Wall

Floor

<Installation of Wall-mounted Unit>
Attach the wall-mounted unit in the installation surface using two or three M5 screws.

Recommended mounting screw (M5)
Length: 8 mm or more
Flat washer of Φ10 mm or less(small round)

After the wall-mounted unit is attached to the wall, install the main unit in the wall-mounted unit.

CAUTIONInstall the unit so that its surface is in intimate contact with the wall-mounted unit. A space between
the unit and the wall-mounted unit may invite unnecessary vibrations and noises.

27

4. How to Use

4-5. How to wire<Installation Dimensions and Maintenance Space of DV Specification>
Leave the diagonal line area so that the installation space is reserved.

Wall

MIN

4-5. How to wire
NOTE
To use the pyrolyzer unit (PLU-70), see also the separate operating manual.

CAUTION Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not toapply stresses on the detector when (overweight) cables are installed.
 The power cables and signal cables must not be installed together with the motor power cables,
etc. When these cables must be installed together for unavoidable reasons, put the power cables
and signal cables in a metal conduit. The conduit must be connected to a grounding circuit.
 When stranded wires are used, prevent wires from contacting each other.
 Use the dedicated handling lever to wire.

28

4. How to Use

4-5. How to wire

<Recommended Cables>● 4 - 20 mA/NT/EA/LN Specification
For 3-wire type (common cable for powerand signal) (4 - 20 mA/EA specification)
For 2-wire type (power and signal cables
separated) (4 - 20 mA/EA specification)
For 2-wire type DC power-line
communication system (NT specification)
For Ethernet (EA)

Shielded cable of CVVS, etc. (1.25 mm2) - 3-core
Power: Cable of CVV, etc. (1.25 mm2) - 2-core
Signal: Shielded cable of CVVS, etc. (1.25 mm2) - 2-coreShielded twisted-pair cable of KPEV-S, etc. (1.25 mm2) 1P
Power: Cable of CVV, etc. (1.25 mm2) - 2-core
Signal: Ethernet cable (category 5 or higher)
Ethernet cable (category 5 or higher)
Shielded twisted pair cable of KPEV-S, etc. (1.25 mm2) ・1P
Cable of CVV, etc. (1.25mm2) - max. 6-core

For PoE (EA)
For LONWORKS output cable
For contact● DV Specification
Power supply
For contact
SignalCVVS (1.25 mm2), etc. 2-core or equivalent cable
CVV (1.25 mm2), 4-core or equivalent cable
Dedicated DeviceNet cable<Terminal Plate>● 4 - 20 mA/NT/EA Specification
1

2

3

+
－
24 VDC4+－
4 - 20 mA

5

6

7

8

9

10

ALM1
contact

ALM2
contact

FAULT
contact

5

7

9●LN Specification
1

2

+
－
24 VDC

3

4+－
LONWORKS
output6

ALM1
contact

8

ALM2
contact

10

FAULT
contact

NOTE

 For the 3-wire type (4 - 20 mA/EA specification), the terminal 2 is used for common, and theterminals 2(-) and 3(+) are used to output 4 - 20 mA.
 For NT specification, the terminals 3 and 4 are not used.
 For EA specification with PoE connection, the terminals 1 and 2 are disabled. (Connection
prohibited)

Specifications of Terminal Plate
Rated voltage: 250 VAC
Rated current: 16 A
Connection conditions

Cable: 0.08 - 2.5 mm2
Bare wire length: 8 - 9 mm
Connecting tool: Dedicated handling lever (accessory)

Conductive
part

Top handling slot

Dedicatedhandling leverCage clamp/spring
Driver slot

29

Wiring hole

4. How to Use

4-5. How to wire

● DV Specification
Terminal plate for power/contact

Green Blue Purple Grey Brown Red

Top
BottomNote) Do not remove the wiring of the top terminal plate.
Terminal plate for DeviceNet
Black

Blue

White

Red
Terminal
plate

V(Black)
CAN_L(Blue)

Drain

V+
(Red)

CAN_H
(White)Specifications of terminal plate
Rated voltage: 250 VAC
Rated current: 12 A
Connection conditions

Solid wire/stranded wire: 0.2 - 2.5 mm2
Bare wire length: 7 mmScrew tightening torque: 0.5 - 0.6 Nm
Connecting tool: Flathead screwdriver (width 3.5 mm or less, thickness 0.6 mm or less)30

4. How to Use

4-5. How to wire

CAUTION
The specified bare wire length must be observed when the wire insulation is peeled off.
Improper clamping of the wire due to a shorter bare wire length may cause defective electric
conduction or heating.
Catching the wire insulation due to a shorter bare wire length may cause defective electric
conduction or heating.
Exposing the wire due to a longer bare wire length may cause defective insulation or a short circuit.
Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may
cause defective insulation or heating.
8 - 9 mm

Compatible bar terminal
For a bar terminal, the following items are available.
(4 - 20 mA/NT/EA/LNBar terminal (ferrule): Model 216 Series (manufactured by WAGO)
specification)Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by
WAGO)(DV specification)
Bar terminal: Model AI series (manufactured by Phoenix Contact)Crimping tool: Model CRIMPFOX UD 6 (manufactured by Phoenix
Contact)

CAUTION
A bar terminal of the specified model must be used. Using other bar terminals invalidates thewarranty of the performance.

<How to Connect to Terminal Plate>
When cables are connected to the connectors, use the dedicated lever or a flathead screwdriver to do it
as shown below.

CAUTION
The right tools must be used.
In principle, one wire can be connected to one wiring hole.
When the wire is inserted into the driver slot by mistake, it does not contact the conductive part. Thismay cause defective electric conduction or heating.
When the wire is inserted under the spring by mistake, it does not contact the conductive part. Thismay cause defective electric conduction or heating.

31

4. How to Use

4-5. How to wire

Push the dedicatedhandling lever to open theterminals, into which you
can insert wires(one wire to one terminal).

NOTE<How to Use the Dedicated Handling Lever>While holding down the lever, insert
the wire into the (round) wiring holeuntil it reaches the deepest point.
Once the lever is released, the wire issecured.

Push the lever with yourfinger to lower the spring in
its inside.

To check whether the wire is connected securely, pull the wire gently. (Do not pull the wire strongly.)<How to Clamp Cables>
Insert the supplied fastening-band to the hole on the wall-mounted unit as shown in the figure. Position
the band so that its coarse side faces the wire. After inserting the fastening-band, fix the wire together.

Position theband so thatits coarse side
faces the wire.

32

4. How to Use

4-5. How to wire

NOTE
When an optional cable gland is used, it must be attached to the external wiring hole.

<Grounding>Connect the detector to your grounding terminal.

WARNING
Before turning on the detector, never fail to connect it to a grounding terminal.
For stable operation of the detector and safety, it must be connected to a grounding terminal. Do notconnect the grounding wire to a gas pipe. The grounding must be made as D type grounding (below
100 Ω of grounding resistance).

● 4 - 20 mA/NT/EA/LN Specification

Grounding screw (M4)

Bottom33

4. How to Use

4-5. How to wire

● DV Specification

Grounding bolt (M4)

Bottom<How to Use Communication Connectors>
When using the detector in combination with the pyrolyzer unit (PLU-70) (option) or GD-70D-EA, connect
the detector to each of them by inserting a cable into a communication connector on the bottom of themain unit.
Dedicated communication Dedicated communication cable connector (See the operating manual forcable for PLU-70
PLU-70)Ethernet cable
RJ45 connector

NOTE<Removal of Communication Connector Covers>

 Insert a small flathead screwdriver into a gap where the lug of thecommunication connector cover is protruding, and pull it up in the direction ofan arrow in the figure to remove it. Be careful not to damage the connector
pins inside by pushing in the flathead screwdriver.
 The communication connector cover is a one-piece component of covers for a
dedicated communication cable for the PLU and an Ethernet cable. Since thecover can be easily split, use it in a way that suits your needs. Keep the coverattached to the connector while it is not connected.
 When you attach the cover, first fit the lug to the main unit and then push in the cover.

34

4. How to Use

4-5. How to wire

<Wiring Example>
Connecting to the indicator (3-wire type - 4 - 20 mA/EA specification)
GD-70D
GD-70D-EA
1

2

3

4

5

6

7

8

9

10

RM-5003, etc.
+24V
GND
SIG

Power
supplyConnecting to the upper unit (DCS, PLC) (2-wire type - 4 - 20 mA/EA
specification)
GD-70D
GD-70D-EA
1

2

3

4

5

6

7

8

9

10

Power supply(24 VDC)+-

Upper unit
(DCS, PLC)+-

Connecting to the multi-display unit (RM-70NT) (NT specification)
GD-70D-NT

Power supply(24 VDC)+-

1

Blocking filter
(B/F)
+

-

Upper unit
(RM-70NT)
24 VDC (+)
24 VDC (-)

35

2

3

4

5

6

7

8

9

10

4. How to Use

4-5. How to wire

Connecting to a stabilized power supply (DV specification)
GD-70D-DV
Detector head
1

2

3

4

5

6

Stabilized power supply

24 VDC
24 VDC (-)

Connecting to the upper unit (PC, PLC) (Ethernet connection - EA
specification)
GD-70D-EA
1Power supply(24 VDC)
Upper unit
(PC, PLC)+-

Switching
hub

36

2

3

4

5

6

7

RJ45 connector

8

9

10

4. How to Use

4-5. How to wire

Connecting to the upper unit (PC, PLC) (PoE connection - EA
specification)
GD-70D-EA
1

2

3

4

5

6

7

8

9

RJ45 connector

Upper unit
(PC, PLC)
Switchinghub(with PoE
function)

Connecting to the upper unit (PLC, etc.) (DV specification)
GD-70D-DV
Detector head

1

2

3

4

5

Upper unit
(PLC, etc.)

VCAN_
Drain
CAN_
V+

CAUTION
Do not supply power simultaneously via PoE supply and 24V power supply (terminals 1 and 2).

37

10

4. How to Use

4-5. How to wire

Connecting to the upper unit (LN specification)
GD-70D-LN
1

Power
supply(24 VDC)
Upper unit
(LON)

+
-

38

2

3

4

5

6

7

8

9

10

4. How to Use

4-6. How to tube

4-6. How to tube
NOTE
To use the pyrolyzer unit (PLU-70), see also the separate operating manual.

The detector has an Rc1/4 thread inside of the sampling inlet/outlet (GAS IN, GAS OUT), to which“polypropylene” unions are normally attached. Because their material varies depending on the gas to be
used, please specify the gas.
The compatible tube is a polytetrafluoroethylene (PTFE) tube of Φ6 (OD) - Φ4 (ID). The tube must be
installed with the supplied ferrules and sleeves attached to prevent a leak.
When the tube is cut, its cut point has a smaller inner diameter. Use a file etc. to expand the innerdiameter of the cut point. To remove cut-dust or other materials remaining inside of the tube, blow
compressed air into the tube before connecting it to the detector.
Some sample gases have highly adsorptive or corrosive property. Select the tube material taking into
account of these precautions.
The flow rate of the detector itself is approximately 0.5 L/min under the operating temperatures. When agas is drawn from a distant point, please consult us on the tube length.

Union

Inner

SleevePipe

WARNING The detector is designed to draw gases under the atmospheric pressure.
If excessive pressure is applied to the sampling inlet and outlet (GAS IN, GAS OUT) of thedetector, detected gases may be leaked from its inside, thus leading to dangers. Be sure that
excessive pressure is not applied to the detector while used.
 Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) on theback of the detector to which an exhaust tube is connected, to a point regarded as a safe place.

394. How to Use

4-6. How to tube

CAUTION The longer the tube of the GAS IN is, the longer it takes for a gas to reach the detector. Becausesome gases have a highly adsorptive property for the tube, resulting in a slow response and alower reading than the actual value, the length of the GAS IN tube must be minimized.
 When the humidity in the sampling point is high, condensation may be formed inside of the tube.
Make sure to avoid condensation when using a gas which is dissolved into water and corrodes
contacted materials, such as a strong acid gas, because it may disable the detector for detecting
gas and furthermore may corrode internal parts. Also avoid an excessive U-shaped or V-shaped
tube piping.
 Determine the inlet for the sample gas, considering the airflow of the sample gas line and the gas
generating process.
 To remove dust, never fail to attach the supplied dust filter in the middle of the tube.
 It is needed to decide the length and material of the tube. Please contact RIKEN KEIKI for more
information.

40

5. How to Operate

5-1. Preparation for start-up

5
5.

How to Operate

5-1. Preparation for start-up
Before connecting a power supply, read and understand the following precautions. Ignoring theseprecautions may cause an electric shock or damage the unit.
Connect the detector to a grounding circuit.
Check that the external wiring is done properly.
Check that the power supply voltage is compliant with the specification.

Because the external contact may be activated during the adjustment, take measures to prevent anactivated contact from having influences on external circuits.
Check that there is no clogging or leak in the connected tube. (If the connected tube is clogged,pressure is applied to the sensor unit, causing errors and malfunctions. Note that the reading isfluctuated in the galvanic cell type and NDIR (Non-Dispersive Infrared Absorption) type, which may
result in a false alarm.

Check that the filter is attached properly. (The filter is specified based on the gas to be detected.)41

5. How to Operate

5-2. Basic operating procedures

5-2. Basic operating procedures
Normally, the detection mode is used for normal operations. (The detection mode is activated after the
power is turned on.)The detector isrestarted after
recovering fromfault.

PW●

PW: POWER
A1: ALM1
A2: ALM2
F: FAULT<Detection Mode>
A2 F
LCD
○
○

A1
○

0.0 ppm●: Lamp on○: Lamp off

SIH4
MODE
(long
pressing)

PW
●

A1
●

<Gas Alarm Status>
A2 F
LCD
○
○

PW
●

6.0 ppm<Maintenance Mode (user mode)>A1 A2 F
LCD
○
○
○

ZERO

SIH4

PW
●

A1
○

MAINTENANCE<Fault Alarm Status>
A2 F
LCD
○
●

<Maintenance Mode (regular maintenancemode)>PW A1 A2 F
LCD
●
○
○
○

E-5

2- 0

FLOW

PW
●

A1
○

1- 1

MODE
(long pressing)<Gas Alarm Test Mode>
A2 F
LCD
○
○

GAS TESTMAINTENANCE

TEST(long pressing)

0.0 ppm

TEST OFF
MAINTENANCEWARNING
When the detector enters each mode from the detection mode while an alarm is activated, the alarm
contact is released.

42

5. How to Operate

5-3. How to activate the detector

5-3. How to activate the detectorBefore turning on the power switch, check that the detector is installed properly.
The power switch is protected by a cover to prevent access to it in a normal time. To turn ON/OFF thepower switch, rotate the switch cover. (Return the switch cover to the original position after theswitching is completed.)
Turn ON the power switch.
After the detector completes the start-up, it enters the detection mode swiftly.
BottomWhen the switch
cover is closed

When the switch
cover is open

Power switch

OFF

ON
Slide

<Start-up Procedures (approximately 25 seconds for system check of the detector and alarmdeactivation)>
Power On↓
Initial Clear

PW
●

A1
○

A2
○

F
○

LCD

---WARM UP↓
Gas Specifications
Display

●

○

○

○

SIH4

↓
Detection Mode↓
15.0 ppm

●

○

○

○

↓
0.0 ppm
SIH4

43

WARNING
When Oxygen (OSU) is selected,
approximately AIR (normal oxygen
concentration) (20.9 vol%) is
output after the detector is started
in the atmosphere. For a
specification where an alarm istriggered by the AIR (normal
oxygen concentration) output (e.g.
0 - 5 vol%), be careful of an alarm
issue after the detector is started.

5. How to Operate

5-4. Modes

CAUTION Do not turn off the detector during the initial clear. The detector is reading the sensor memory
during the initial clear.
 If a new sensor unit is installed or the sensor unit is replaced after the detector is started, thesensor unit must be warmed up for a specified period which is determined depending on the typeof the sensor unit.
When the semiconductor type sensor unit (SGU) and the hot-wire semiconductor type sensor unit
(SHU) is selected, the expected warm-up completion time is displayed in the maintenance mode.
During the warm-up, the alarm activation and output signals are unstable. Provide a priornotification to the related sections so that they can prepare for false abnormalities.
 The pyrolyzer unit (PLU-70) must be warmed up for approximately one hour. Therefore, whenusing this unit, warm it up with the detector.
 After the warm-up is completed, check that the reading on the flow rate indicator corresponds tothe specified flow rate, and then perform a calibration.

5-4. Modes
Details on each mode are provided as follows. (* Operations are slightly different depending on thedetector type or sensor unit.)
Mode
Item
LCD display
Details
Detection
Gas
Normalstate－
mode
concentration
Gas name
Gas Alarm
Gas
Perform the alarm test.
－
test mode
concentration
Maintenance Zero adjustment
1-1 ZERO
Perform zero adjustment.
mode(Span adjustment)(1-1 SPAN)(In case of oxygen 0 - 25 vol%, perform span
(User)
adjustment.)
Setting display
1-2
Show the typical settings.
CONFIRM
First alarm setpoint (AL1)Second alarm setpoint (AL2)
Alarm delay time
Zero suppression value
Zero follower ON/OFF
Sensitivity Correction ON/OFF
Flow rate indicator
1-3 FLOWShow the current flow rate.
Address display
1-4
Show the address.
ADDRESS
Main unit version
1-5 70D VER Show the program version of the main unit.
display
Unit version display
1-6 UNIT VER Display the program version of the sensor unit.
Net version display
1-7 NET VER Show the program version of the communication
function.
Regular
1-8 M MODE Switch to the regular maintenance mode. *1
maintenance modeswitching
Maintenance Gas introduction
2-0 GAS
Perform the gas introduction test in the regularmode
display
TEST
maintenance mode.
(Regular
Zero adjustment
2-1 ZERO
Perform zero adjustment.
maintenance) Span adjustment
2-2 SPAN
Perform span adjustment.
Last calibrated date
2-3 LAST CAL Show the last calibrated date.
Bias voltage
2-4 BIASShow the bias voltage.
(Element voltage)(2-4 E VOLT) (Display the element voltage.)
Flow rate setting
2-5 DEF
Set the flow sensor with the flow rate at 0.5 L/min.
(adjusted to 0.5 L/min) FLOW
Pump ratio/flow rate
2-6 FLOWShow the output and flow rate of the current pump.
44

5. How to Operate*15-4. Modes

indicator
Detector temperature

2-7 TEMP

Expected warm-up
completion date/time

2-8
WARMTIME

Environmental
setting 1

2-9
SETTING1

Environmental
setting 2

2-10
SETTING2

Pyrolyzer data
display

2-11 PL
DATA

Show the current temperature of the installation
environment.
Show the expected warm-up completion for
semiconductor type (SGU) and hot-wire semiconductor
type(SHU)
Operation setting
INHIBIT setting (INHIBIT)
Alarm value setting (ALM P)Alarm delay time setting (ALM DLY)Regular replacement operation (pump stop)(MAINTE)
Fault alarm test (F TEST)
Functions setting
Address setting (ADDRESS)
Date/Time setting (DAY TIME)
Zero suppression value setting (SUPPRESS)
Zero suppression system setting (SUP TYPE)Contact setting for alarm test (TEST RLY)External output setting for alarm test (TEST4-20)
Energized/De-energized setting (RLY PTRN)
Alarm type setting (ALM TYP)
Alarm activation setting (ALM PTRN)
Alarm value limiter setting (AL LIMIT)
Fault activation setting (FLT PTRN)Flow rate auto-adjustment setting (AT FLOW)Zero follower ON/OFF setting (ZERO F)
24 hours zero follower ON/OFF setting (ZERO 24F)

Sensitivity correction ON/OFF setting (S ASSIST)
External output in maintenance mode setting (MNT
OUT)

External output adjustment (MA 4-20)
Backlight setting (BK LIGHT)ETHERNET setting (ETHERNET)Pump drive level diagnosis ON/OFF setting (PUMPCK)
When the pyrolyzer unit (PLU-70) is used, a variety ofpyrolyzer data is displayed. (See the operating manualfor PLU-70)
Not used.
Not used.

Fault investigation
2-12 FAULT
Factory mode
2-13 Fswitching
MODE
For GD-70D-EA specification, there are 「1-8 COM SET Communication output setting」,「1-9 M MODE
Regular maintenance mode switching」.

45

5. How to Operate

5-5. Detection mode

5-5. Detection mode
<Flow Rate Indicator>
Because the flow rate of the detector is automatically adjusted by the flow rate control function, the flow
rate, in principal, does not need to be controlled. As shown on the figure below, when the flow rate does
not correspond to the specified flow rate for some reasons, it is adjusted automatically.

Low flowt

Normal flowt

Excess flowt

CAUTION
If the automatic flow rate adjustment does not work (due to clogged tube or leak), messages such as"FLOW" for an unstable flow rate or “E-05” for flow rate abnormalities are displayed. In this case, youmust identify the causes and take appropriate actions.

5-6. Alarm test modeThis is used when dummy signals the same as the signals of the gas concentration are generated tocheck the alarm lamp activation of the detector and the transmission to external circuits.

WARNING
Before starting the alarm test (transmission test), provide a notification to the related sections so thatthey can prepare for false abnormalities (external output signals and alarm contact). After the test iscompleted, never fail to press the TEST key to return to the detection mode. (If the detector remains
in the alarm test mode, it automatically returns to the detection mode in ten hours.)<Alarm Test Mode>
Detection Mode
Press the TEST key for threeseconds.

PW
●

A1
○

A2
○

F
○

0.0 ppm
SIH4↓
Alarm Test Mode
The message ”TEST ON” isdisplayed when the contact is
activated in the alarm test, while
the message “TEST OFF” isdisplayed when not activated. (Thesetting can be changed.)
Increase or decrease the reading
by pressing the ▲ or ▼ key.

LCD

●

○

○

○

↓
0.0 ppm
TEST OFF
MAINTENANCE

46

5. How to Operate

5-7. User mode↓First Alarm
When the reading reaches the firstalarm, the ALM1 lamp lights up.
(When Contact ON is selected, thefirst alarm contact is activated.)

●

●

○

○

TEST OFF
MAINTENANCE↓
Second Alarm
When the reading reaches thesecond alarm, the ALM2 lamp
lights up. (When Contact ON is
selected, the second alarm contact
is activated.)↓
5.0 ppm

●

●

●

○

↓
10.0 ppm
TEST OFF
MAINTENANCE

5-7. User mode
WARNING
After the adjustment is completed, never fail to press the MODE key to return to the detection mode.
(If the detector remains in the user mode, it automatically returns to the detection mode in ten
hours.)<User Mode>
Detection Mode
Press the MODE key forthree seconds.

PW
●

A1
○

A2
○

F
○

LCD

0.0 ppm
SIH4↓↓

User Mode
1-1. ZERO
Perform zeroadjustment.

●

○

○

○

1- 1

→
SET

Zero adjustment
P50

→
SET

Setting display
P51

→
SET

0.50

ZERO

=>

MAINTENANCE

↓↑▼
1- 2

▲
1-2. CONFIRM
Show the typicalsettings.

●

○

○

○

CONFIRM=>

MAINTENANCE

↓↑▼
1- 3

▲
1-3. FLOWShow the current flow
rate.

●

○

○

○

FLOW
MAINTENANCE

↓↑▼

▲

47

L/M
MAINTENANCE

5. How to Operate

5-7. User mode

↓↑▼
1- 4

▲
1-4. ADDRESSShow the address.
(NT specification), (DVspecification)

●

○

○

○

→
SET

ADDRESSADDRESS

MAINTENANCE

↓↑▼
1- 5

01
MAINTENANCE▲
1-5. 70D VER
Show the program
version of the main unit.

●

○

○

○

→
SET

01234

70D VER

56AB

MAINTENANCE

↓↑▼
1- 6

MAINTENANCE▲
1-6. UNIT VER
Show the program
version of the installed
sensor unit.

●

○

○

○

→
SET

01234

UNIT VER

56AB

MAINTENANCE

↓↑▼
1- 7

MAINTENANCE▲
1-7. NET VER
Show the program
version of thecommunication function.
(NT specification)

●

○

○

○

→
SET

01234

NET VER----

MAINTENANCE

↓↑▼
1- 8

MAINTENANCE▲
1-8. M MODE
Switch to the regular
maintenance mode.

●

○

○

○

→
SET

See "7-2. Regular
maintenance mode".

→
SET

01234

M MODE
MAINTENANCE↓↑▼▲

To 1-1. ZERO

【In case of GD-70D-EA】
1-7. NET VER
Show the program
version of thecommunication function.
(NT specification)

●

○

○

○

1- 7
NET VER----

MAINTENANCE

↓↑▼
1- 8

MAINTENANCE▲
1-8.COM SET
Set communication
output.
Press the ▲ or ▼ key toselect thecommunication output,
and then press the SET
key to confirm the value.

●

○

○

○

COM SET
MAINTENANCE

48

⇔
SET

A
COM SET
MAINTENANCE

5. How to Operate

5-7. User mode

｜↑
｜｜
｜｜
｜｜
▲｜｜▼
｜｜
↓｜
1- 9

A: Analog transmission
E: Ethernet
EA: Ethernet and analog
transmission

1-9. M MODE
Switch to the regular
maintenance mode.

●

○

○

○

↓↑▼
E

▲

COM SET
MAINTENANCE▲↓↑▼

EA
COM SET
MAINTENANCE→
SET

See "7-2. Regular
maintenance mode".

M MODE
MAINTENANCE↓↑▼▲

To 1-1. ZERONOTE Communication output setting 1-8 (COM SET) is displayed only for EA specification.
 In EA specification, if only analog transmission is used (Ethernet is not used), if the communication
output setting is set to A, Communication Abnormalities E-6 does not occur even if an Ethernet cable
is not connected.

49

5. How to Operate

5-7. User mode

<Zero Adjustment "1-1">This is used to perform the zero adjustment. Before starting the zero adjustment, let the detector draw thezero adjustment gas and wait until the reading is stabilized.
For oxygen deficiency alarm specification (OSU - 0 - 25 vol%), "1-1" is the span adjustment. In this case,the fresh air adjustment is performed, so that fresh air must be introduced to adjust it to 20.9 vol%. For
information on the span adjustment, see “7-3. Calibration method”.
<Zero Adjustment>
1-1. ZERO
Press SET key.

PW
●

AL1
○

AL2
○

F
○

LCD

1- 1
ZERO
MAINTENANCE↓
Current Concentration Value Display
Press the SET key to perform thezero adjustment.

●

○

○

○

↓
1.1 ppm
ZERO SET
MAINTENANCE↓
Zero Adjustment Completed
The menu returns to 1-1. ZERO
automatically.

●

○

○

○

↓
0.0 ppm
ZERO OK
MAINTENANCE↓
Return to 1-1. ZERO* When the zero adjustment fails

●

○

○

○

0.0 ppm
ZERO NG
MAINTENANCE↓
Return to 1-1. ZERO50

5. How to Operate

5-7. User mode

<Setting Display "1-2">This is used to check the setting of typical menus.
<Setting Display>
1-2. CONFIRM
Press SET key.

PW
●

A1
○

A2
○

F
○

1- 2
CONFIRM
MAINTENANCE↓
First Alarm Setpoint
Display

LCD

●

○

○

○

↓
5.0 ppm
AL 1
MAINTENANCE↓↑▼
10.0 ppm▲

Second Alarm
Setpoint Display

●

○

○

○

AL 2
MAINTENANCE

↓↑▼
2

▲
Alarm Delay Time
Display (seconds)

●

○

○

○

ALM DLY
MAINTENANCE↓↑▼
0.9 ppm▲

Zero Suppression
Value Display

●

○

○

○

SUPPRESS
MAINTENANCE

↓↑▼
ON

▲
Zero Follower
ON/OFF Display(If ESU or SSU is
installed)

●

○

○

○

ZERO F
MAINTENANCE

↓↑▼
OFF

▲
Sensitivity Correction
ON/OFF Display(If ESU installed)

●

○

○

○

S ASSIST
MAINTENANCE↓↑▼▲To First Alarm
Setpoint Display

51

5. How to Operate

5-8. How to exit

5-8. How to exit
To turn off the detector, open the switch cover on the bottom of the main unit and turn "OFF" the powerswitch. Then, turn off the power supply (24 VDC) to the indicator/alarm unit.

WARNING When the detector is turned off, an alarm may be triggered on the upper (central) system.
Before turning off the detector, the inhibit (point skip) on the upper (central) system must be
activated.
Decide whether the power can be turned off by checking the operation of the devices connected tothe external output or external contact output terminal of the detector.
 If the alarm contact is energized (option), it is activated when the detector is turned "OFF".
 If the gas to be detected has an adsorptive property, the detector must be cleaned thoroughly withfresh air before turning "OFF" the detector.

52

6. Operations and Functions

6-1. Gas alarm activation

6
6.

Operations and Functions

6-1. Gas alarm activation
Gas alarm: Triggered when the concentration of detected gas reaches or exceeds the alarm setpointvalue. <Auto-Reset Operation>

NOTE
The alarm setpoint (first alarm and second alarm) is factory-set. Although the alarm delay time (standard:
2 seconds) works in the detector to prevent a false activation, it can be cancelled if not needed.
<Display Operation>
Gas Concentration Display
In case of over the detection range (Over Scale), "∩∩∩∩" is displayed on the LCD.
Power Indicator Lamp (POWER: Green)This lights up continuously.
Alarm Indicator Lamp (ALM1: Red), (ALM2: Red)
The alarm consists of two steps. Each of them lights up when the respective alarm setpoint value isreached to or exceeded.
<Contact Activation（Auto-reset）>
In case of Auto-reset setting, the contact is activated when the gas concentration reaches or exceeds thealarm setpoint value. The contact activation is reset automatically when the gas concentration drops
below the alarm setpoint value.

NOTE
In DETECTION MODE, select and press one of the following key to reset : “MODE”, “▲”, “▼” or“TEST/SET”.
"Alarm Pattern (H-HH)"

53

6. Operations and Functions

6-1. Gas alarm activation"Alarm Pattern (L-H)""Alarm Pattern (L-LL)"(* oxygen deficiency alarm)54

6. Operations and Functions

6-1. Gas alarm activation<Contact Activation（Self-latching）>
In case of Self-latching setting, the contact is activated when the gas concentration reaches or exceeds
the alarm setpoint value. The alarm indication lamp blinks during warning. It changes to a light after resetis performed. It turns off when the gas concentration drops below the alarm set point value.
"Alarm Pattern (H-HH)"

55

6. Operations and Functions

6-1. Gas alarm activation"Alarm Pattern (L-H)"

56

6. Operations and Functions

6-1. Gas alarm activation"Alarm Pattern (L-LL)"

57

6. Operations and Functions

6-2. Fault alarm activation<Response to Gas Alarm>
In case of responding to a leaked gas
When a gas alarm is triggered, take actions in accordance with your management rules of gas alarm.
Normally, take the following actions.

Check the reading of the detector.

NOTE
If a gas leak is momentary, the reading may already have dropped when checking it. In addition, when thealarm is triggered by noise or other incidental conditions other than a gas, the reading may have already
dropped.


Based on your management rules of gas alarm, no one can be allowed to access the monitored zone
to ensure safety.
If the Gas Concentration Display continues to be shown, close the main valve of the gas, and thencheck that the gas concentration reading is dropped.
Assuming that gases remain, wear protective equipment to avoid dangers and go to the gas leakpoint, and then check if gases remain using a portable gas detector etc.
If you can determine that the point is free from dangers, take actions to fix the gas leak.

6-2. Fault alarm activation
A fault alarm is triggered when the detector detects abnormalities. After a fault alarm is triggered, the
FAULT lamp (yellow) lights up and an error message is displayed on the LCD. Determine the causes andtake appropriate actions.
After the detector is successfully returned from the fault, it restarts with the process normally performed
right after it is turned on (initial clear).
If the detector has problems and is repeatedly malfunctioning, contact RIKEN KEIKI immediately.

* E-5 FLOW
(flow rate abnormalities)

NOTE
For information on malfunctions (error messages), see " Troubleshooting".
9.

CAUTION
When the F. S. Exceeded state persists for a long time, or when there is a possibility of highlyconcentrated gas coming into contact with the sensor, the sensor may be damaged. Please contact
RIKEN KEIKI.

58

6. Operations and Functions

6-3. External output operation

6-3. External output operation● 4 - 20 mA/NT/EA Specification
4 - 20 mA (4 - 20 mA and EA)
Specifications

Power-line
communication system(NT)
2-wire type DC powerline communication
KPEV-S
Below 300m

Ethernet (EA)

(depending on the system
conditions)(depending on the system
conditions)

Signal transmission
methodTransmission path
Transmission
distance

Analog transmission (nonisolated)
CVVS
Below 1 km

Ethernet (10BASE-

Connection
load
resistance(1)
Detection
mode

Below 300 Ω－

4 - 20 mA (concentration
output)Concentration data

4 - 20 mA (concentration
output)Concentration data, Alarm bits

Depending on the setting of (4)2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting:
4 mA*
2.5 mA setting: 2.5 mA
4 mA setting: 4 mA*
HOLD setting: The previous
value retained
4-20 mA setting: 4 - 20 mA(concentration output)
Output ON setting: 4 - 20 mA(concentration output)
Output OFF setting: The
previous value retained
0.5 mA (fixed)
Depending on the setting of (4)2.5 mA setting: 2.5 mA
4 mA, HOLD, 4 - 20 mA setting:
4 mA*
0 mA

Initial bit

T/100BASE-TX)

Ethernet cable
Below 100m

(no alarm)(2)

Detectionmode(gas alarm)(3)

Initialclear(4)

Maintenance
mode

(5)

Alarm test

(6)
(7)

Fault alarm
Inhibit(8)

Concentration data, Adjustment bit

Concentration data, Adjustment bit, Test bit

Fault bits
Concentration data, Adjustment bit, Inhibit bit

Power
Signal OFF
interruption* OSU - 0 - 25 vol% is equivalent of AIR (20.9 vol% = 17.4 mA)● DV Specification
Specifications
DeviceNet
Signal transmission
DeviceNet
methodTransmission path
Dedicated DeviceNet cable
Transmission rate
500/250/125 kbps auto-detect
500 m (125 kbps) branch line length 6 m or less, total branch line length 156 m orless
125 m (250 kbps) branch line length 6 m or less, total branch line length 78 m or
lessTransmission
100 m (500 kbps) branch line length 6 m or less, total branch line length 39 m or
distance
less* The above figures apply when a thick cable is used for the trunk line. When a thincable is used, the length will be 100 m or less.
Connection load―
resistance59

6. Operations and Functions

6-3. External output operation● LN Specification
LONWORKS (LN)
Specifications
Signal transmission
LONWORKS
methodTransmission path
KPEV-STransmission rate
78kbpsTransmission
Max 2700m
distance* When bus topology (Double ended termination ) is used.
Connection load―
resistance
Example of Gas Concentration and External Output
4 - 20 mA(Maintenance output: 2.5 mA setting)External
22mA
20 mA

Detection mode
Maintenance mode

4mA
2.5 mA
Zero
0

Gas concentration
Full scale

CAUTION<Analog Transmission (4 - 20 mA)> The 4 - 20 mA output is already adjusted. In case of over scale, an output will not exceed 22 mA.
 Output during inhibit or initial clear is based on 4 - 20 mA output setting in the maintenance mode. Be
careful for a possible lower output which drops as low as 2.5 mA during initial clear when OSU (L alarm) isused. In particular, this occurs when the detector is started or the specification is changed. Understand how
the detector functions, and take actions, if necessary, so that the receiver side cannot get false alarms (e.g.
making an inhibit status).
<Example of Items which Requires Special Precautions>
Analog transmission
Digital transmission
Sensor unit
4 - 20 mA/EA
NT
EA
DV
LN
specification
specification
specification
specification
specification
Use OSU (L-LL, Output 2.5 mA during
L-H)
maintenance or inhibit.
Possibility of false alarm－－－－in the upper unit (Lalarm).
Specification
In case of a change fromchangeanother principle (H-HH),(To OSU - 0 - 25 4 mA (equivalent of
vol%)concentration zero) isused until the change is
Before the specification change is confirmed, the data for theconfirmed "C-02".
sensor unit with a different specification is already output toSpecification
In case of a change fromthe digital data.
change0 - 25 vol% (L-LL,L-H),(From OSU - 0 - 17.4 mA (equivalent of
25 vol%)approx. 84%FS) is useduntil the change isfid "C 02"60

6. Operations and Functions

6-3. External output operation<Communication Specifications>GD-70DPower-line
The detector is used in a local network formed with a multi-display unit (RMNT
communication
70NT) as the base unit. For more information, see the operating manual of thesystemmulti-display unit.
GD-70DEthernet
The detector offers functions that work in liaison with external software using
EA
a standard network protocol. For details, see the separate manual forcommunication function.
Web function (HTTP), mail send function (SMTP), and time synchronization
function (SNTP)
Use a Web browser of an upper-unit PC to view and change setting values
and perform calibration and test on a graphical user interface.
SMTP, when receiving a gas alarm or fault alarm from an external mailserver, can send a notification mail to a registered address.
SNTP, receiving time information from a time server, can correct the clock at
regular intervals.
Modbus slave function (Modbus/TCP)Works as a Modbus slave and feeds back a setting value in response to aread request or changes a setting value in response to a write request.
PLC linkage function (FINS・MC)
Sends a setting value to PLC to provide information to be processed by PLC
in a ladder program. Reading from PLC is also available to change a setting
value or perform calibration and test.
GD-70DDeviceNet
An internationally standardized network specification for device control.
DV
DeviceNet implements high-speed data transmission via serial
communication to handle control and setting data of devices with a single
signal line. It can use rich-featured devices (RS-232C, analog, andmathematical devices) as slaves.
With DeviceNet, the identity of a slave can be identified via the network,
enabling communication between devices from different manufacturers
supporting DeviceNet as well as data exchange with equivalent devices fromother manufacturers.
GD-70DLONWORKS
An internationally standardized network specification for device control.It is a
LN
network specification that controls and manages not only gas detectors but
also air conditioning, lighting etc. equipment by the same communication
protocol called Lon-talk.
By constructing an open system, it becomes possible to connect the system
without being bound by one manufacturer, it is possible to facilitateprocurement of parts at the time of equipment failure, and to increase design
flexibility.

61

6. Operations and Functions

6-4. Other functions

6-4. Other functions<Suppression Function>
Some types of sensor used with the detector are influenced by environmental changes (temperature,humidity, and other characteristics) or interference gases (interference characteristics) in no small
measure, which affects the reading.
Therefore, the reading might fluctuate around zero even at a normal state with no gas leakage.
This function obscures influences by environmental changes and interference gases around zero thathave no meaning for your management rules of gas alarm. This function is used to hide (suppress) the
fluctuation of the reading under the setting value, indicating zero.
<Example: SiH4 0 - 15 ppm rated range>
Suppression Disabled
A fluctuation around zero is displayed as the reading.

0.5 ppm
SIH4↓
0.0 ppm
SIH4

Suppression Enabled
A fluctuation under the standard setting value = 6% FS(0.9 ppm) is hidden with zero.
(Zero suppression)

NOTE In the maintenance mode, this function is disabled and the fluctuation of the reading under the setting
value is displayed.
 When a sensor unit with the oxygen deficiency alarm (OSU 0 - 25 vol%) is equipped, the zero
suppression is shifted to AIR suppression (20.9 vol%) automatically. That is, a small fluctuation of
the reading around 20.9 vol% is displayed as 20.9 vol%.

CAUTIONA reading under zero is suppressed with the 10% FS suppression.
A reading that gets 10% FS or more under zero is displayed as "-0.0", which prevents an accurate
gas detection and needs the zero adjustment.

62

6. Operations and Functions

6-4. Other functions<Zero Follower Function>
Some types of sensor used with the detector might have sensitivity variations after being used for a long
period.
This function corrects the variation of the reading at the zero point (zero drift) among the sensitivity
variations over time by a program manipulation to stabilize the zero point, and works on the electrochemical
type (ESU), pyrolysis-particle type (SSU), new ceramic type (NCU) and NDIR(Non-Dispersive Infrared
Absorption) type(IRU).
Zero Follower Off

Zero Follower On

Reading

Reading⇒Zero point

0

Zero point

0

Time

Time

* The zero drift of the sensor appears as thereading.

* The zero-adjustment is made periodically.

<Sensitivity Correction Function>
Some types of sensor used with the detector might have sensitivity variations after being used for a long
period.
This function compensates the deterioration of the gas sensitivity among the sensitivity variations overtime. It works on the electrochemical type (ESU) and makes the span adjustment by a program
manipulation based on the principled deterioration pattern.
Sensitivity Correction Off

Sensitivity Correction On

Reading

Reading⇒

Calibration

0

Calibration

0

Time

* The sensor sensitivity becomes deteriorated.

* The span is lifted up periodically.

CAUTION
The sensitivity correction is just an auxiliary function. It uniformly lifts the span up based on theprincipled deterioration pattern only and cannot consider the sensitivity variation of an individual
sensor.
To correct the sensitivity variation of an individual sensor, you must make the regular span
adjustment using calibration gas.

<Calibration History/Alarm Trend History/Event History Functions>
The detector and the sensor unit have their own history functions. To use these functions, please contact
RIKEN KEIKI.

63

Time

6. Operations and Functions

6-4. Other functions<Sensor Unit Automatic Recognition Function>
The detector has the function to automatically recognize the sensor unit when the sensor unit is replacedor the specification is changed. When a sensor unit with a different serial number or with a different
principle or specification is attached, one of the following messages is displayed for helping the correct
installation.

C-01
CHG UNIT
MAINTENANCE

Unit Replacement
Displayed when a unit with the same specification(principle, type, and so on) is attached (e.g. in a regularreplacement).
Press the MODE key to recognize the new sensor unit
and start the detector.
The following is displayed alternately if the unit that you
installed has the same or earlier date of manufacture thanthe one that has been replaced.

"CHG UNIT" <=> "USED SEN"*** Check for correct installation if this message isdisplayed because an old sensor might have been
installed by mistake.

C-02
CHG SPEC
MAINTENANCE

Specification Change
Displayed when a unit with a different specification(principle, type, and so on) from the previous one is
attached.
Press the MODE key to recognize the unit with the new
specification and start the monitor.
If you do not intend the specification change, this message
might mean the installation error. Check the correct
installation.

CAUTION
If you confirm the specification change (principle, sensor type, detected gases, detectable range,and so on) of the sensor unit for "C-02", the specification of the gas detector head is changed. Notethat it resets the alarm setpoint (ALM P) as well as the following parameters to the standard setting
values.
If you want to use nonstandard setting values, set them in the maintenance mode.
 Alarm delay time setting (ALM DLY) Suppression value (SUPPRESS) Alarm type (ALM TYP) ...... The OSU specification includes "L-LL", "L-H", and "H-HH".
<Standard Setting Values by Principle>
Alarm delay
Suppression
value
Alarm type

Alarm delay
Suppression
value
Alarm type

ESU

SSU

NCU

SGU

2-second
6%FS
H-HH
IRU
(0-500ppm)
2-second
30 ppm2-second
2-second
2 ppm
6%FS(TEOS)(0-100%LEL)
H-HH
H-HH
SHU
(0-2000ppm)
2-second
200 ppm

H-HH

H-HH

OSU
(0-25 vol%)2-second 2-second
10%FS
0.5 vol%(AIR supp)
H-HH
L-LL

OSU
OSU
(0 - 5 vol%) (0 - 50 vol%)2-second
2-second
0 vol%
0 vol%
H-HH

H-HH"Change from OSU (L-LL alarm)" or "change to OSU (L-LL alarm)" reverses the direction of thealarm. It requires special care because the previous settings are kept for the external output andother settings in the maintenance mode. Immediately after "C-02" is confirmed with the MODE key,
the initial clear is started and the new actions are enabled. (The initial clear output is shifted
together.)64

6. Operations and Functions

6-5. About LONWORKS (LN specification)

6-5. About LONWORKS (LN specification)＜Binding method＞

WARNING When adjustment is completed, press the MODE key and be sure to return to detection
mode.
(When left in user mode, it automatically returns to detection mode after 10 hours.)≪User mode≫
Detection mode

PW
●

A1
○

A2
○

F
○

Press the MODE key

LCD

0.0ppm
SIH4

for 3 seconds.

↓↓

User mode
1-1.ZERO
Perform the zeroadjustment.

●

○

○

1- 1

○

ZERO

→
SET

Zero Adjustment⇒P51

MAINTENANCE
To reissue the neuron ID, please press the MODE key in user mode for 3 seconds, return to the detectionmode, and enter the user mode again.

65

6. Operations and Functions

6-5. About LONWORKS (LN specification)

GD-70D-LN LonWorks Diagram
Open-lLoop Sensor Functional Block
nvoConc
SNVT_ppm_f
nvoNstate
SNVT_state

Mandatory
Implementation Specific
nviReset
SNVT_lev_discnvoAlarmS
SNVT_switch
nvoFaultS
SNVT_switch
nvoGasName
SNVT_str_asc
nvoHertBeat
SNVT_state

nviComand
SNVT_str_asc

nvoComand
SNVT_str_asc

Virtual Function Block
nciMaxSendTM
SNVT_time_sec
nciMinSendTM
SNVT_time_sec
nciMaxSendTl
SNVT_time_sec
nciMinSendTl
SNVT_time_sec
nciMaxSendHB
SNVT_time_sec666. Operations and Functions
NO. Variable name

Variable type1

nvoConc

SNVT_ppm_f2

nvoNstate

SNVT_state3

nvoAlarmS

SNVT_switch

4

nvoFaultS

SNVT_switch

5

nvoGasName

SNVT_str_asc

6

nvoHertBeat

SNVT_state

7
8
9
10
11
12
13
14

nviReset
nciMaxSendTM
nciMinSendTM
nciMaxSendTI
nciMinSendTI
nciMaxSendHB
nviComand
nvoComand

SNVT_lev_disc
SNVT_time_sec
SNVT_time_sec
SNVT_time_sec
SNVT_time_sec
SNVT_time_sec
SNVT_str_asc
SNVT_str_asc

6-5. About LONWORKS (LN specification)
Contents
It is the same as the current density output.
Floating point of 16 BIT synchronizes with the display of the detection
part.
It is the same as the current density output.
Status of 16 BIT expresses measurement unit, alarm, breakdown etc.
Expression of alarm state by switch
OFF:{0.0,0}
1st :{1.0,1}
2nd :{1.5,1}
1st & 2nd: {2.0,1}
Expression of fault condition by switch
Normal：{0.0,0}
Fault:{X.X,1} - - X.X : 1.0 = Sensor fault: 5.0 = Flaw rate fault: 7.0 = Pyrolyzer fault: 9.0 = System fault
Send measured gas name and measurement unit in ASCII character
string.
From the beginning, we send unit after space (20H) with gas nameand the rest is ASCIL(00H = NULL)Count up 8 BIT of 0 to 7 of 16 BITCount every second and count it. If it is OVER, start with 0.
8 to 15 BIT is reserved.
RESET signal in case of self-latching 0:non not 0:RESET
1 and 2 update maximum time
1 and 2 update minimum time
3 ~ 5 update maximum time
3 ~ 5 update minimum time
6 update maximum time
Command input of ASCII 30 byte
Command output of ASCII 30 byte

You can select the transmission status with the combination of the setting point of nciMaxSendTM (8) andnciMinSendTM (9).
・nciMaxSendTM (8) ＝ Asec nciMinSendTM (9) = Bsec －－＞ (1) and (2) transmit every Asec when
there is no VAL update. If Bsec has not elapsed since last transmission, wait until Bsec has elapsed
before sending it even if VAL is updated.
・nciMaxSendTM (8) ＝ Asec nciMinSendTM (9) = 0sec －－＞ (1) and (2) transmit every Asec when
there is no VAL update. If there is an update of VAL, it will be sent immediately.
・nciMaxSendTM (8) ＝ 0sec nciMinSendTM (9) = Bsec －－＞ (1), (2) don’t transmit every Asec when
there is no VAL update. If Bsec has not elapsed since last transmission, wait until Bsec has elapsed
before sending it even if VAL is updated.
You can select the transmission status with the combination of the setting point of nciMaxSendTI (10) andnciMinSendTI (11).
・nciMaxSendTI (10) ＝ Asec nciMinSendTI (11) = Bsec －－＞ (3) ~ (5) transmit every Asec when
there is no VAL update. If Bsec has not elapsed since last transmission, wait until Bsec has elapsed
before sending it even if VAL is updated.
・nciMaxSendTI (10) ＝ Asec nciMinSendTI (11) = 0sec －－＞ (3) ~ (5) transmit every Asec when
there is no VAL update. If there is an update of VAL, it will be sent immediately.
・nciMaxSendTI (10) ＝ 0sec nciMinSendTI (11) = Bsec －－＞ (3) ~ (5) don’t transmit every Asec
when there is no VAL update. If Bsec has not elapsed since last transmission, wait until Bsec has
elapsed before sending it even if VAL is updated.

67

6. Operations and Functions

6-5. About LONWORKS (LN specification)

You can select the transmission status with the setting point of nciMaxSendHBb(12)・nciMaxSendHB (12) = Asec －－＞ (6) transmit every Asec.
・nciMaxSendHB (12) = 0sec －－＞ (6) don’t transmit every Asec.
It outputs to nvoComand (14) for input data of nviComand (13).
・nviComand (13) = "A1, R," －－＞ nvoComand (14) = "A1, R, ××××"
××× express 1st alarm point read value in hexadecimal.
・nviComand (13) = "A2, R," －－＞ nvoComand (14) = "A2, R, ××××"
×××× express 2nd alarm point read value in hexadecimal.
・nviComand (13) = "AD, R," －－＞ nvoComand (14) = "AD, R,××××"
×××× express Alarm delay time (mesc 10 units) read value in hexadecimal.

68

7. Maintenance7-1. Maintenance intervals and items

7
7.

MaintenanceThe detector is an important instrument for the purpose of safety.
To maintain the performance of the detector and improve the reliability of safety, perform regular
maintenance.

NOTE
To use the pyrolyzer unit (PLU-70), see also the separate operating manual.

7-1. Maintenance intervals and items

Daily maintenance: Perform maintenance before beginning to work.
Monthly maintenance: Perform maintenance on the alarm circuit (alarm test) once a month.
Regular maintenance: Perform maintenance once or more for every six months to maintain theperformance as a safety unit.
Maintenance content
Daily
Monthly
Regular
Maintenancemaintenance maintenance maintenance
itemPower supply
check
Concentration
display check

Flow rate
check
Filter check
Alarm testSpanadjustment
Gas alarm
check

Check that the power lamp lights up.

○

○

○

Check that the concentration display value iszero (or 20.9 vol% on the oxygen deficiency
meter). When the reading is incorrect, performthe zero adjustment (fresh air adjustment)
after ensuring that no other gases exist
around it.
See the flow rate indicator to check for
abnormalities.
Check the dust filter for dust or clogging.
Inspect the alarm circuit by using the alarm
test function.
Perform the span adjustment by using thecalibration gas.
Check the gas alarm by using the calibration
gas.

○

○

○

○

○

○

○

○
○

○
○
○
○

<About Maintenance Services>

We provide services on regular maintenance including span adjustment, other adjustments andmaintenance.
To make the calibration gas, dedicated tools, such as a gas cylinder of the specified concentrationand gas sampling bag must be used.
Our qualified service engineers have expertise and knowledge on the dedicated tools used forservices, along with other products. To maintain the safety operation of the detector, please use ourmaintenance service.
Typical maintenance services are listed as follows. Please contact RIKEN KEIKI for more information.

69

7. Maintenance7-1. Maintenance intervals and items

Main Services
Power supply
check

:

Concentration
display check:

Flow rate check:

Filter check:

Alarm test:Spanadjustment
Gas alarm
check:

Cleaning andrepair of thedetector(visualdiagnosis)
Unit operation
check
Replacement ofconsumable
parts

:

:

Checks the power supply voltage.
Verifies that the power lamp lights up.
(Verifies that relevant points can be identified on the system.)(When a UPS (uninterruptible power system) is used, checks the operation with the UPS.)
Verifies that the concentration display value is zero (or 20.9 vol% on the oxygen deficiency meter)
by using the zero gas.
Performs the zero adjustment (fresh air adjustment) if the reading is incorrect.
Checks the flow rate indicator to find abnormalities.
Checks the flow rate by using an external flow meter to verify the correctness of the flow rate
indicator on the detector. If the flow rate is incorrect, performs the flow rate adjustment.
Checks the dust filter for dust or clogging.
Replaces a dirty or clogged dust filter.
Inspects the alarm circuit by using the alarm test function.

Checks the alarm lamps. (Checks each activation of ALM1 and ALM2.)
Checks the external alarm. (Checks the activation of the external alarm, such as a buzzer.)
Performs the span adjustment by using the calibration gas.
Checks the gas alarm by using the calibration gas.
Checks the alarm. (Checks triggering of alarm when the alarm setpoint is reached.)

Checks the delay time. (Checks time to delay until the alarm is triggered.)
Checks the alarm lamps. (Checks each activation of ALM1 and ALM2.)
Checks the external alarm. (Checks the activation of external alarms, such as a buzzer andreset signal.)
Checks dust or damage on the surface, cover or internal parts of the detector, and cleans or repairs
such parts as needed.
Replaces parts which are cracked or damaged.

:

Uses the keys to check the operation of functions and parameters.

:

Replaces consumable parts, such as a sensor, filter and pump.

<Contact information>USA
RKI INSTRUMENTS, INC.
TEL: +1-510-441-5656
FAX: +1-510-441-5650
MAIL: bob@rkiinstruments.com, sandra@rkiinstruments.com
ADDRESS: 33248 CENTRAL AVENUE, UNION CITY, CA94587-2010 U.S.A.
WEB: http://www.rkiinstruments.com/
GERMANYRIKEN KEIKI GmbH
TEL: +49 (0)6196 7777 680, 681
FAX: MAIL: s-ono@rikenkeikigmbh.de
ADDRESS: Mergenthalerallee 77, 65760 Eschborn, Germany
WEB: http://en.rikenkeikigmbh.com/
CHINA
RIKEN KEIKI COMMERCIAL (SHANGHAI) CO.,LTD.
TEL: 86-21-6575-6700
FAX: MAIL: yin@rkkc.net (Mr. Yin wenli), nie@rkkc.net (Ms. Nie lianger), matsui@rkkc.net (Mr. Shinya Matsui)
ADDRESS: Room 1003 GaoBao New Time Square, No.1666 North Sichuan Rd. Hongkou District, 200080, China
WEB: http://www.rkkc.net/

70

7. Maintenance7-1. Maintenance intervals and items

KOREA
RIKEN KEIKI KOREA CO., LTD.
TEL: 82-51-712-9900
FAX: 82-51-518-7736
MAIL: master@rikenkeiki.co.kr
ADDRESS: 23, HWAJEONSANDAN 2-RO 134, GANGSEO-GU, BUSAN, 46741 KOREA
WEB: http://rikenkeiki.co.kr/bn/
TAIWANRIKEN KEIKI TAIWAN CO., LTD.
TEL: 886-6-581-1224
FAX: 886-6-581-1164
MAIL: rk-taiwan@rikenkeiki.com.tw
ADDRESS: No. 87, YANGMING ROAD, SHANHUA DISTRICT, TAINAN CITY, TAIWAN
WEB: https://www.rikenkeiki.com.tw/index.php?action=about
SINGAPORER K INSTRUMENTS (S) PTE LTD
TEL: 65-6275-3398
FAX: 65-6275-3387
MAIL: rk@rkinstruments.com.sg
ADDRESS: 102F PASIR PANJANG ROAD #03-11, CITILINK WAREHOUSE COMPLEX SINGAPORE 118530
WEB: http://www.rkinstruments.com.sg/
BRAZILHIDEO NAKAYAMA IMP. EXP. COM. E INDUSTRIA LTDA
TEL: +55-21-2590-3496
FAX: +55-21-2270-6390
MAIL: hideko@nakayama.com.br
ADDRESS: RUA SANTA AMÉLIA, 33 PRACA DA BANDEIRA RIO DE JANEIRO RJ CEP: 20.260-030 BRAZIL
WEB: http://www.nakayama.com.br/

71

7. Maintenance7-2. Regular maintenance mode

7-2. Regular maintenance mode
WARNING
After the adjustment is completed, never fail to press the MODE key to return to the detection mode.
(If the detector remains in the regular maintenance mode, it automatically returns to the detection
mode in ten hours.)
Mode
Maintenancemode(Regularmaintenance)

Item
Gas
introduction
display
Zero adjustment=> P88LCD display
2-0 GASTEST
2-1 ZERO

Details
Perform the gas introduction test in the regular maintenance mode.

Span Adjustment=> P892-2 SPAN

Perform span adjustment.

Last calibrated date

2-3 LAST
CAL
2-4 BIAS(2-4 EVOLT)
2-5 DEF
FLOW

Show the last calibrated date.

Pump ratio/flow rate
indicator=> P902-6 FLOWShow the output and flow rate of the current pump.

Detector temperature

2-7 TEMPShow the current temperature of the installation environment.

Expected warm-up
completion date/time

2-8
WARMTIMEShow the expected warm-up completion for semiconductor type
(SGU) and hot-wire semiconductor type(SHU).

Environmental setting 1=> P76

2-9
SETTING1

Environmental setting 2=> P782-10
SETTING2

Operation setting
INHIBIT setting (INHIBIT)
Alarm value setting (ALM P) => P77

Alarm delay time setting (ALM DLY)Regular replacement operation (pump stop) (MAINTE)

Fault alarm test (F TEST) => P78
Functions setting
Address setting (ADDRESS)
Date/Time setting (DAY TIME) => P83
Zero suppression value setting (SUPPRESS)
Zero suppression system setting (SUP TYPE)Contact setting for alarm test (TEST RLY)External output setting for alarm test (TEST4-20)
Energized/De-energized setting (RLY PTRN) => P84

Alarm type setting (ALM TYP)
Alarm activation setting (ALM PTRN)
Alarm value limiter setting (AL LIMIT)
Fault activation setting (FLT PTRN)Flow rate auto-adjustment setting (AT FLOW)Zero follower ON/OFF setting (ZERO F)
24 hours zero follower ON/OFF setting (ZERO 24F)

Sensitivity correction ON/OFF setting (S ASSIST)
External output in maintenance mode setting (MNT OUT)

External output adjustment (MA 4-20)

Bias voltage (Element
voltage)
Flow rate setting(adjusted to 0.5 L/min)=> P90

Perform zero adjustment.

Show the bias voltage.
(Display the element voltage.)
Set the flow sensor with the flow rate at 0.5 L/min.

Backlight setting (BK LIGHT)ETHERNET setting (ETHERNET)

72=> P85

7. Maintenance7-2. Regular maintenance mode

Pyrolyzer data display


Pump drive level diagnosis ON/OFF setting (PUMP CK)When the pyrolyzer unit (PLU-70) is used, a variety of pyrolyzer data
is displayed. (See the operating manual for PLU-70)
Not used.

2-11 PL
DATA
2-12 FAULT

Fault investigation
Factory mode switching

2-13 FMODE

Not used.

<Regular Maintenance Mode>
User ModeIn "1-8. M MODE", press
the SET key.

PW
●

A1
○

A2
○

F
○

LCD

1- 8
M MODE
MAINTENANCE↓
Then press the SET key
again for three seconds.

↓
●

○

○

○

-

---

M MODE
MAINTENANCE↓
To 2-0.GAS TEST【In case of GD-70D-EA】
User ModeIn "1-9. M MODE", press
the SET key.

●

○

○

○

1- 9
M MODE
MAINTENANCE↓
Then press the SET key
again for three seconds.

↓
●

○

○

○

-

---

M MODE
MAINTENANCE↓
To 2-0.GAS TEST73

PW: POWER
A1: ALM1
A2: ALM2
F: FAULT●: Lampon○ : Lamp
off7. Maintenance7-2. Regular maintenance mode

Regular Maintenance mode
2-0. GAS TEST
Perform a test with the gas.
Similar to the detectionmode, the reading changes
and the alarm lamp lights
up after the gas is
introduced, but the contact
is not activated.

2-1. ZERO
Perform zero adjustment.

●

○

○

○

2- 0

→
SET

GAS TESTGAS TESTMAINTENANCE

●

○

○

｜↑
▲｜｜▼
↓｜
2- 1

○

0.2 ppm
MAINTENANCE↓(Alternate Display)↑

0.2 ppm
SIH4
MAINTENANCE→
SET

Zero adjustment=> P88→
SET

Span Adjustment=> P89

→
SET

12:00

ZERO
MAINTENANCE

↓↑▼
2- 2

▲
2-2. SPAN
Perform span adjustment.

●

○

○

○

SPAN
MAINTENANCE

↓↑▼
2- 3

▲
2-3. LAST CALShow the last calibrated
date.

●

○

○

○

LAST CAL

2009.01.01

MAINTENANCE

↓↑▼
2- 4

MAINTENANCE▲
2-4. BIAS
Show the bias voltage"BIAS" of electrochemical
type (ESU) or the element
voltage "E VOLT" ofsemiconductor type (SGU)
and hot-wire semiconductor
type(SHU) .
2-5. DEF FLOW
When there is a difference
between the actual flow rate
and flow rate display,
perform default setting forflow rate.
Normally, this is not usedbecause the detector has
already been adjusted.
On the other hand, if theflow meter is set at otherthan the specified flow rate,gases cannot be detected
properly due to an incorrect
flow rate.(Press the MODE
key to cancel this menu.)

●

○

○

○

→
SET

0 mV

BIAS

BIAS

MAINTENANCE

MAINTENANCE

↓↑▼

▲
●

○

○

○

2- 5
DEF FLOW
MAINTENANCE

｜↑
｜｜
▲｜｜▼
↓｜

74

⇔
SET

1000
DEF FLOW
MAINTENANCE

7. Maintenance2-6. FLOWShow the output and flowrate of the current pump.

7-2. Regular maintenance mode
●

○

○

○

2- 6
FLOW

⇔
SET

MAINTENANCE

↓↑▼
2- 7

50%
0.50 L/M
MAINTENANCE▲
2-7. TEMPShow the temperature of
the detector.

●

○

○

○

→
SET

TEMP

TEMP

MAINTENANCE

↓↑▼
2- 8

25.0ºC
MAINTENANCE▲
2-8. WARMTIMEShow the expected warmup completion date/time forsemiconductor type (SGU)
and hot-wire semiconductor
type(SHU), which requires
a long warm-up time.
2-9. SETTING1
Specify the environmental
setting 1.

●

○

○

○

→
SET

WARMTIME

2009.01.01

MAINTENANCE

↓↑▼
2- 9

12:00
MAINTENANCE

▲
●

○

○

○

→
SET

Environmental Setting
1 => P76→
SET

Environmental Setting
2 => P78→
SET

Pyrolyzer data display
See the operating
manual for PLU-70.

SETTING1
MAINTENANCE

↓↑▼
2-10

▲
2-10. SETTING2
Specify the environmental
setting 2.

●

○

○

○

SETTING2
MAINTENANCE

↓↑▼
2-11

▲
2-11. PL DATAShow the pyrolyzer datawhen the pyrolyzer unit
(PLU-70) is used.

●

○

○

○

PL DATA
MAINTENANCE

↓↑▼
2-12

▲
2-12. FAULTThis is used (by the
manufacturer) to investigate
and analyze the causes offaults. This is not used by
the user.

●2-13. F MODE
Enter the factory mode.
This is not used by the user.

●

○

○

○

FAULT
MAINTENANCE

↓↑▼
2-13

▲
○

○

○

F MODE
MAINTENANCE↓↑▼▲

To 2-0. GAS TEST75

7. Maintenance7-2. Regular maintenance mode

<Environmental Setting 1 "2-9">
In the environmental setting 1, specify the operation setting.
<Environmental Setting
1>
2-9. SETTING1
Press SET key.

PW

A1

A2

F

LCD

●

○

○

○

2- 9
SETTING1
MAINTENANCE↓
SET 0. INHIBIT
Set the inhibit.
Select either ON/OFF,and then press the SET
key to confirm theselection.
When ON is selected, themessage INHIBIT isdisplayed on the LCD. As
a result, an alarm is not
triggered to external
circuits even though thedetector is in thedetection mode.
SET 1. ALM P
Set the alarm value.

●

○

○

↓
SET 0

○

INHIBIT⇔SET

MAINTENANCE

○

○

○

SET 1
ALM P

INHIBIT
MAINTENANCE
▲↓↑▼

ON

｜↑
▲｜｜▼
↓｜
●

OFF

INHIBIT
MAINTENANCEINHIBIT⇔
SET

Alarm Value=> P77⇔
SET

2

Setting

MAINTENANCE

↓↑▼
SET 2

▲
SET 2. ALM DLY
Set the alarm delay time.
Change the value(second) by pressing the▲ or ▼ key, and thenpress the SET key toconfirm the value.
SET 3. MAINTEThis is used to stop only
the pump for replacing
the pump or for anotherpurpose.
Press the SET key to stop
the pump. Press the SET
key again to restart thepump, which returns to
the original state.
(Pressing the MODE key
also enables to cancel
this menu and restart thepump.)●SET 4. F TEST
Perform a fault alarm test.

●

○

○

○

ALM DLY
MAINTENANCE

↓↑▼
SET 3

ALM DLY
MAINTENANCE

▲
●

○

○

○

MAINTE⇔SET

MAINTENANCE

○

○

SET 4
F TEST
MAINTENANCE

76

MAINTE
MAINTENANCE
Pump Stop(Drive sound stop)

｜↑
▲｜｜▼
↓｜
○

-----

⇔
SET

Fault Alarm Test=> P78

7. Maintenance7-2. Regular maintenance mode↓↑▼▲

To SET 0. INHIBIT
Setting<Alarm Value Setting "2-9" - "SET 1"><Alarm Value Setting>SET 1. ALM P
Press SET key.

PW
●

A1
○

A2
○

F
○

LCD

SET 1
ALM P
MAINTENANCE↓
First Alarm Value Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.
(Press the MODE key to skip thismenu.)

●

○

○

○

AL 1
MAINTENANCE↓
Second Alarm Value Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.
(Press the MODE key to skip thismenu.)↓
5.0ppm

●

○

○

○

↓
10.0ppm
AL 2
MAINTENANCE↓
Return to SET 1. ALM
P77

7. Maintenance7-2. Regular maintenance mode

<Fault Alarm Test "2-9" - "SET 4">
PW●

SET 4. F TEST
Press SET key.

A1
○

A2
○

F
○

LCD

SET 4
F TEST
MAINTENANCE↓
Fault Alarm Test ON/OFF
Select either ON/OFF.
Switch ON and press the SET key
to trigger the fault alarm.
Return to OFF and press the SET
key to cancel the test.
(Pressing the MODE key alsoenables to cancel this menu and togo back to the original state.)

●

○

○

↓
OFF

○

F TEST
MAINTENANCE
▲↓↑▼
●

○

○

●

ON
F TEST
MAINTENANCEWARNINGBe careful to perform the test because the contact (fault) can be activated only by a fault alarm testin the maintenance mode. The fault alarm test cannot be performed during inhibit.

<Environmental Setting 2 "2-10">
In the environmental setting 2, specify the settings of functions. (* It is recommended that setting changes
should be recorded in a log.)
The environmental setting 2 includes setting menus which are usually not used. Be careful not to changethese settings by mistake.
<Environmental Setting 2>
PW A1
A2
F
LCD
●
○
○
○
2-10. SETTING2
Press SET key.

2-10

SETTING2

MAINTENANCE↓
SET 0. ADDRESS
Set the address.
(NT specification), (DVspecification)
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.
SET 1. DAY TIME
Set the date/time of themain unit.

●

○

○

↓
SET 0

○

ADDRESS⇔SET

MAINTENANCE

01
ADDRESS
MAINTENANCE

↓↑▼

▲

●

○

○

○

SET 1
DAY TIME
MAINTENANCE

↓↑▼

▲

78

⇔
SET

Date/Time setting
P83=>

7. Maintenance

SET 2. SUPPRESS
Set the suppression
value.
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.
SET 3. SUP TYPE
Set the suppression
system.
Select either
CUT/SLOPE, and thenpress the SET key toconfirm the selection.
When CUT (Cut Off) isselected, values
exceeding the
suppression value are
directly displayed. When
SLOPE (Slope) is
selected, values
exceeding the
suppression value are
gently displayed.

7-2. Regular maintenance mode

●

○

○

○

SET 2
SUPPRESS⇔SETMAINTENANCE

0.9ppm
SUPPRESS
MAINTENANCE

↓↑▼

▲
●

○

○

○

SET 3
SUP TYPE⇔
SETMAINTENANCE

CUT
SUP TYPE
MAINTENANCE
▲↓↑▼

｜↑
｜｜
▲｜｜▼
↓｜

SLOPE
SUP TYPE
MAINTENANCE

NOTE
When an address corresponding to the DV specification is set for SET 0. ADDRESS, turning off the power
and restarting will be necessary to reflect the setting. After setting the address, turn off the power and thenon again.

SET 4. TEST RLY
Set the contact activation
for an alarm test.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, thecontact can be activatedeven during an alarm test.

SET 5. TEST4-20
Set the external output foran alarm test.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, theexternal output (4 - 20 mA)
is output even during an
alarm test.
When OFF is selected, theoutput is kept at the one justbefore the alarm test modeis entered (HOLD).

●

○

○

○

SET 4
TEST RLY⇔
SET

MAINTENANCE

○

○

○

SET 5
TEST4-20
MAINTENANCE

｜↑
｜｜
▲｜｜▼
｜｜
79

TEST RLY
MAINTENANCE
▲↓↑▼

｜↑
▲｜｜▼
↓｜
●

OFF
ON
TEST RLY
MAINTENANCE

⇔
SET

ON
TEST4-20
MAINTENANCE
▲↓↑▼

OFF
TEST4-20
MAINTENANCE

7. Maintenance

SET 6. RLY PTRN
Select either energized/deenergized for the contact.

7-2. Regular maintenance mode

●

○

○

↓｜
SET 6

○

RLY PTRN⇔
SET

MAINTENANCE

↓↑▼
SET 7

Energized/Deenergized Contact
Setting=> P84▲
SET 7. ALM TYPE
Set the alarm type.
When the galvanic cell type
(OSU) is installed, you canselect either L-LL, L-H, or
H-HH.

●

○

○

ALM TYPE
MAINTENANCE

｜↑
｜｜
｜｜
｜｜
▲｜｜▼
｜｜
↓｜

●
SET 8. ALM PTRN
This is a setting screen of
the gas alarm activation. Do
not change the setting when
the detector is used in anormal way, because it
determines how thedetector functions.
(Auto-reset setting: "nL")●
SET 9. AL LIMITThis is a setting screen of
the alarm value limiter. Do
not change the setting when
the detector is used in anormal way. (ON setting)

○

●

○

SET 10. FLT PTRN
This is a setting screen of
the fault alarm activation.
Do not change the setting
when the detector is used ina normal way, because it
determines how thedetector functions.
(Auto-reset setting: "nL")

○

○

○

SET 8
ALM PTRN
MAINTENANCE

↓↑▼

▲

○

○

○

SET 9
AL LIMIT
MAINTENANCE↓↑▼
SET 10▲○○FLT PTRN
MAINTENANCE

↓↑▼

▲

80

⇔
SET

L-LL
ALM TYPE
MAINTENANCE
▲↓↑▼

L-H
ALM TYPE
MAINTENANCE
▲↓↑▼

H-HH
ALM TYPE
MAINTENANCE

7. Maintenance

SET 11. AT FLOW
Set the flow rate autoadjustment.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, theflow rate auto-adjustment is
activated.

7-2. Regular maintenance mode

●

○

○

○

SET 11AT FLOW⇔
SET

MAINTENANCE

SET 12. ZERO F
Set the zero follower whenthe electrochemical type
(ESU) or the pyrolysisparticle type (SSU) or new
ceramic type (NCU) or
NDIR (Non-Dispersive
Infrared Absorption)type(IRU) is installed.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, thezero follower function is
activated.
* When SSU is installed, it
must always be set to ON.

●

SET 13. ZERO 24F
This is a supplemental
setting screen for the above
zero follower function. (Asetting to determine
whether the first-24-hourzero follower will be
performed after the power isturned on.)
Do not change the setting
when the detector is used ina normal way.
(ON setting)●SET 14. S ASSIST
Set the sensitivity correction
when the electrochemical
type (ESU) is installed.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, thesensitivity correction
function is activated.

●

○

○

｜↑
▲｜｜▼
↓｜
SET 12○

ZERO FOFF
AT FLOW
MAINTENANCE
⇔
SET

○

ON
ZERO F
MAINTENANCE
▲↓↑▼

OFF

｜↑
▲｜｜▼
↓｜
○

AT FLOW
MAINTENANCE▲↓↑▼

MAINTENANCE○

ON

ZERO F
MAINTENANCE

SET 13
ZERO 24F
MAINTENANCE

｜↑
▲｜｜▼
↓｜
○

○

○

SET 14S ASSIST
MAINTENANCE

｜↑
▲｜｜▼
↓｜

81

⇔
SET

ON
S ASSIST
MAINTENANCE
▲↓↑▼

OFF
S ASSIST
MAINTENANCE

7. Maintenance

SET 15. MNT OUT
Set the external output forthe maintenance mode.
Select either 2.5 mA/4.0
mA/HOLD (previous
value)/4 - 20 mA (linked todisplay value), and thenpress the SET key toconfirm the selection.
(4 - 20 mA specification)

7-2. Regular maintenance mode

●

○

○

○

SET 15MNT OUT⇔SET

MAINTENANCE●

SET 17. BK LIGHT
Set the backlight.
Select either ON/SAVE, andthen press the SET key toconfirm the selection.
When ON is selected, thebacklight lights up
continuously.
When SAVE is selected, thebacklight is usually turnedoff, but lights up only during
an operation or event.

●

○

○

○

SET 16
MA 4-204.0mA
MNT OUT
MAINTENANCE
▲↓↑▼

HOLD
MNT OUT
MAINTENANCE▲↓↑▼

4 - 20 mA
MNT OUT
MAINTENANCE⇔
SETMAINTENANCE○○

SET 17
BK LIGHT
MAINTENANCE

｜↑
▲｜｜▼
↓｜

82

100%
4MA ADJMAINTENANCE
↓

｜↑
｜｜
▲｜｜▼
｜｜
↓｜
○

MNT OUT
MAINTENANCE
▲↓↑▼

｜↑
｜｜
｜｜
｜｜
▲｜｜▼
｜｜
｜｜
｜｜
↓｜

SET 16. MA 4-20
Adjust the external output (4- 20 mA).
Adjust the output (%) bypressing the ▲ or ▼ key,
and then press the SET key
to confirm the value.
(It must be adjusted to theupper unit or the ammeter.)
After adjustment of 4 mA is
completed, perform theadjustment of 20 mA.
(Press the MODE key toskip this menu.)(4 - 20 mA specification)

2.5 mA

100%
20MA ADJ
MAINTENANCE

⇔
SET

ON
BK LIGHT
MAINTENANCE
▲↓↑▼

SAVE
BK LIGHT
MAINTENANCE

7. Maintenance
SET 18. ETHERNET
Set Ethernet.

7-2. Regular maintenance mode
●

○

○

○

SET 18ETHERNET⇔SETETHERNET setting=> P85

MAINTENANCE↓↑▼
SET 19▲SET 19. PUMP CK
Set the pump drive level
diagnosis.
Select either ON/OFF, andthen press the SET key toconfirm the selection.
When ON is selected, themessage "FLOW" isdisplayed if the flow rate issufficient even though thepump drive level is low. (Afunction to check theconditions for applying
pressure, etc.)

●

○

○

○

⇔
SET

PUMP CK
MAINTENANCE

OFF
PUMP CK
MAINTENANCE

To SET 0. ADDRESS<Date/Time Setting "2-10" - "SET 1"><Date/Time Setting>SET 1. DAY TIME
Press SET key.

A1
○

A2
○

F
○

LCD

SET 1
DAY TIME
MAINTENANCE↓
Date/Time Setting Display
Press SET key.

●

○

○

○

↓
12:00
2009.01.01
MAINTENANCE

Year Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.

Month Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.

Date Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.

●

○

○

○

↓
12:00
2009.01.01
MAINTENANCE

●

○

○

○

↓
12:00
2009.01.01
MAINTENANCE

●

○

○

○

↓
12:00
2009.01.01
MAINTENANCE↓
83

PUMP CK
MAINTENANCE
▲↓↑▼

｜↑
▲｜｜▼
↓｜

PW
●

ON

7. Maintenance7-2. Regular maintenance mode

Hour Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.

●

○

○

○

12:00
2009.01.01
MAINTENANCE↓
Minute Setting
Change the value by pressing the▲ or ▼ key, and then press the
SET key to confirm the value.

●

○

○

○

12:00
2009.01.01
MAINTENANCE↓
Return to SET 1. DAY
TIME* In the Date/Time Setting mode, press the MODE key to cancel this menu and go back to the previous
setting.

<Energized/De-Energized Contact Setting “2-10” - ”SET 6”><Energized/De-Energized Contact Setting>
PW A1
A2
●
○
○
SET 6. RLY PTRN
Press SET key.

F
○

LCD

SET 6
RLY PTRN
MAINTENANCE↓
First Alarm Contact
Setting
Select either nd (deenergized)/nE(energized), and thenpress the SET key toconfirm the selection.
(Press the MODE key toskip this menu.)

●

○

○

↓
nd

○

AL1 RLY
MAINTENANCE↓
Second Alarm Contact
Setting
Select either nd (deenergized)/nE(energized), and thenpress the SET key toconfirm the selection.
(Press the MODE key toskip this menu.)

⇔
▲/▼

●

○

○

↓
nd

○

AL2 RLY
MAINTENANCE

↓

↓

84

nE
AL1 RLY
MAINTENANCE

⇔
▲/▼

nE
AL2 RLY
MAINTENANCE

7. Maintenance7-2. Regular maintenance mode↓
Fault Alarm Contact
Setting
Select either nd (deenergized)/nE(energized), and thenpress the SET key toconfirm the selection.
(Press the MODE key toskip this menu.)

●

○

○

↓
nd

○

FLT RLY
MAINTENANCE

⇔
▲/▼

nE
FLT RLY
MAINTENANCE↓
Return to SET 6. RLY
PTRN

NOTE
When de-energized is selected, the relay is energized and activated in response to an alarm (deenergized at a normal environment).
 When the contact "a" is used, it is open at a normal environment while closed in response to an
alarm.
 When the contact "b" is used, it is activated conversely.
When energized is selected, the relay is energized at a normal environment (de-energized in response toan alarm).
 When the contact "a" is used, it is closed at a normal environment while open in response to an
alarm. In addition, it is closed when the power is OFF.
 When the contact "b" is used, it is activated conversely.

<ETHERNET Setting "2-10" - "SET 18">
<ETHERNET Setting>SET 18. ETHERNET
Press SET key.

PW
●

A1
○

A2
○

F
○

LCD

SET 18ETHERNET
MAINTENANCE↓
MAC Address Check
There are MAC
addresses from MAC1
to MAC6. Select one
using ▲ and ▼ keys
and display them one by
one in the same way.
* MAC addresses are
fixed values unique tothe unit.

●

○

○

↓
00

○

MAC 1
MAINTENANCE↓↑▼▲(MAC2 - MAC6)

↓↑▼

▲

85

7. Maintenance7-2. Regular maintenance mode

↓↑▼
0

▲
IP Address Setting
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.

●

○

○

○

IP 1

⇔
SET

MAINTENANCE

255
IP 1
MAINTENANCE↓↑▼▲(IP2 - IP4)

There are IP addresses
from IP1 to IP4. Selectone using ▲ and ▼keys and set them one
by one in the same way.

↓↑▼
0

▲
Subnet Mask Setting
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.

●

○

○

○

SUB 1

⇔
SET

MAINTENANCE

255
SUB 1
MAINTENANCE↓↑▼▲(SUB2 - SUB4)

There are subnet masks
from SUB1 to SUB4.
Select one using ▲ and▼ keys and set them
one by one in the same
way.

↓↑▼
0

▲
Default Gateway Setting
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.
There are default
gateways from DEF1 to
DEF4. Select one using▲ and ▼ keys and set
them one by one in thesame way.

●

○

○

○

DEF 1
MAINTENANCE↓↑▼▲(DEF2 - DEF4)

↓↑▼

▲

86

⇔
SET

255
DEF 1
MAINTENANCE

7. Maintenance7-2. Regular maintenance mode

↓↑▼
OFF

▲
DHCP Setting
Select either ON/OFF,and then press the SET
key to confirm theselection.
When ON is selected,
an IP address is
automatically obtained
from the DHCP server.
In this case, the IP1 to
IP4, SUB1 to SUB4,
and DEF1 to DEF4
settings are disabled.

●

PLC Mode Setting
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.

●PLC Area Setting
Change the value bypressing the ▲ or ▼key, and then press the
SET key to confirm thevalue.

●

○

○

○

DHCP

⇔
SET

MAINTENANCE○○

1
PLC MODEON
DHCP
MAINTENANCE

⇔
SET

5
PLC MODE

MAINTENANCE

↓↑▼
0

DHCP
MAINTENANCE
▲↓↑▼

｜↑
▲｜｜▼
↓｜
○

OFF

MAINTENANCE

▲
○

○

○

PLC AREA⇔SET15
PLC AREA

MAINTENANCE

MAINTENANCE↓↑▼▲
Setting Result Record
To record the results ofthe settings made in theabove, press the SET
key.

●

○

○

○

→
SET

SAVE
MAINTENANCE↓↑▼▲

SPAN Y/N
MAINTENANCE↓

Press the SET key torecord the setting
results and return to
SET 18. ETHERNET**** In ETHERNET mode, it is necessary to record setting results after all the settings have been selected.
Press the MODE key before completion to undo all the changes that have been made.
MAC Address Check
***

NOTE
It takes 10 seconds or more for the address settings to be recorded and for the settings to take effect on
the system. (Particularly for DHCP, the time it takes depends on the environment.) While the settings are
putting into effect, "0" is displayed for all of MAC1 - 6, IP1 - 4, SUB1 - 4 and DEF1 - 4, and none of the
Ethernet functions is available.

877. Maintenance7-3. Calibration method

7-3. Calibration method
Perform a calibration in each mode (67 mode and span adjustment mode) using the calibration gas.

Zero adjustment gas (collected in a gas sampling bag)Calibration gas (collected in a gas sampling bag)
Gas sampling bag for exhaust gas

WARNING
After the adjustment is completed,never fail to press the MODE key toreturn to the detection mode.
Calibrationgas

GAS IN

Exhaustgas

GAS OUT<Zero Adjustment "2-1">
This is used to perform the zero adjustment.

WARNING
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness
before beginning the adjustment. If interference gases (other than measuring and base gases) exist,
the adjustment cannot be performed properly, thus leading to dangers when the gas leaks.

NOTE
Before starting the zero adjustment, let the detector draw the zero adjustment gas and wait until thereading is stabilized.
<Zero Adjustment>
2-1. ZERO
Press SET key.

PW
●

A1
○

A2
○

F
○

LCD

2- 1
ZERO
MAINTENANCE

Current Concentration Value Display
Press the SET key to perform thezero adjustment.

●

○

○

○

↓
1.1 ppm
ZERO SET
MAINTENANCE

Zero Adjustment Completed
The menu returns to 2-1. ZERO
automatically.

●

○

○

○

↓
0.0 ppm
ZERO OK
MAINTENANCE↓
Return to 2-1. ZERO88

7. Maintenance7-3. Calibration method* When the zero adjustment fails

●

○

○

○

0.0 ppm
ZERO NG
MAINTENANCE↓
Return to 2-1. ZERO

<Span Adjustment "2-2">This is used to perform the span adjustment. For the oxygen deficiency alarm specification (OSU - 0 - 25vol%), this is the same as "1-1".
<Span Adjustment Display>
PW A1 A2 F
LCD
●
○
○
○
2-2. SPAN
Press SET key.

2-2

SPAN

MAINTENANCE↓
Gas Introduction
Introduce a gas, and then press the
SET key when the reading isstabilized.
* In case of less than 10%FS, thisis not switched to the next menu.

●

○

○

○

SPAN GASMAINTENANCE↓
Span Adjustment
Because the reading will be fixed,
adjust the introduced gas
concentration by pressing the ▲ or
▼ key. After adjusting the value,press the SET key.
(20.9 vol% in the oxygen deficiency
alarm specification)

●

○

○

○

↓
8.0ppmSPAN VAL
MAINTENANCE↓
Span Adjustment Completed↓
2.0 ppm

●

○

○

○

↓
8.0 ppm
SPAN OK
MAINTENANCE↓
Adjustment Result Record
To record the adjustment result,press the SET key.
(Press the MODE key to cancel thismenu.)

●

○

○

○

↓
8.0 ppm
SPAN Y/N
MAINTENANCE

↓

↓

89

CAUTION
Do not press the SET
key before thereading is stabilized.

7. Maintenance7-4. Other adjustments/cleaning method↓●

Adjustment Completed
The menu returns to 2-2. SPAN
automatically.

○

○

○

SPAN END
MAINTENANCE

CAUTION↓

Exhaust gas must be collected in theexhaust bag or discharged through theexhaust line.
* When the span adjustment fails↓
8.0 ppm●

Return to 2-2. SPAN

○

○

○

8.0 ppm
SPAN NG
MAINTENANCE↓
Return to 2-2. SPAN

7-4. Other adjustments/cleaning method<Flow Rate Manual Adjustment "2-6" and Flow Rate Default Set "2-5">
The flow rate of the detector is automatically adjusted to 0.5 L/min. Turning off the auto-adjustment
function enables the manual adjustment. (See 2-10 - SET-11)
The manual flow rate adjustment can be performed in the regular maintenance mode "2-6. FLOW".

2-6. FLOW
Press SET key.

PW
●

A1
○

A2
○

F
○

LCD

2-6
FLOW
MAINTENANCE↓
Flow Rate Adjustment
As the output is increased or
decreased by pressing the ▲ or ▼key, the flow rate changes
accordingly. Adjust the flow rate to
0.5 L/min, and then press the SET
key.
(Press the MODE key to cancel
this menu.)

●

○

○

○

↓
50%
0.50 L/M
MAINTENANCE

Regardless of the flow rate auto-adjustment or manual-adjustment, when the reading on the flow rate
indicator is incorrect (due to aging deterioration, improper flow rate default set, or other reasons), it must
be set to provide the right flow rate.
To set the Flow Rate Indicator, prepare and connect a flow meter (which indicates 0.5 L/min precisely),and perform the default set with the flow meter while it is indicating 0.5 L/min in the regular maintenancemode "2-5. DEF FLOW".

90

7. Maintenance2-5. DEF FLOW
Press SET key.

7-5. How to replace parts

PW

A1

A2

F

LCD

●

○

○

○

2- 5
DEF FLOW
MAINTENANCE↓
Flow Rate Adjustment/Default Set
Adjust the flow rate by pressing the▲ or ▼ key until the connected flow
meter indicates 0.5 L/min ±10%, andthen press the SET key.
(Press the MODE key to cancel thismenu.)

●

○

○

○

↓
1000
DEF FLOW
MAINTENANCE

CAUTION
Perform the flow rate default set after checking that the suction volume is 0.5 L/min by using a flow
meter.

WARNING
After the adjustment is completed, never fail to press the MODE key to return to the detection mode.

<Cleaning of Detector>
Clean the detector if it becomes extremely dirty. The gas detector must be turned off while cleaning it. Usea waste cloth to remove dust. Do not use water or organic solvent for cleaning because they may cause
malfunctions.
Because an extremely large amount of dust inside the tube may disturb the gas detection, it must be
cleaned with dry AIR, etc.

7-5. How to replace parts<Replacement of Consumables>
Sensor Unit Replacement
Replace the sensor unit as shown in the figure.
Push the two buttons at the top of the main unit together toopen the front cover. (Pushing only either one button cannot
open the cover, but then pushing the other can open it.)
* The front cover opens about 90 degrees at first. You canpush it down to 180 degrees.
Hold the convexed parts on both sides of the sensor unit
and pull it out. If the sensor unit is hard to detach, insert afinger into the gap at the top right of the sensor unit and pull
it out.

91

7. Maintenance7-5. How to replace parts

When attaching the sensor unit to the main unit, thrust it onto the main
unit and make sure that the sensor unit is securely fixed, otherwise it
might come off.
After replacing the sensor unit, close the front cover. Be sure to checkthe click of the front cover to fix it properly, otherwise it might open
again.

CAUTION Turn OFF the power when the sensor unit is replaced.
 After the sensor unit is replaced, always perform acalibration (zero adjustment and span adjustment).

External Dust Filter Replacement
Because the external dust filter may gradually get dirty or clogged over the time,
it must be replaced regarding the operating conditions. Check the external dust
filter, and then replace it as necessary.

<Replacement of Regular Replacement Parts>
List of recommended regular replacement parts
MaintenanceNo.
Nameintervals

Replacement
intervals

Quantity(pieces/unit)

1

Pump unit

0.5 years

1 to 2 years

1

2

Flow sensor

1 years

5 years

1

Replacement of Pump Unit
Replace the pump unit as shown in the figure.
After detaching the sensor unit, push down to open the pump stopper. Pinch the part labeled "PULL" atthe top of the pump unit, and pull it out.

92

7. Maintenance7-5. How to replace parts

When attaching the pump unit to the main unit, position the grooves of the pump unit at the rails of themain unit and push the pump unit.
Do not push the center diaphragm. Push the part labeled "PULL". And as the connecting point (flow path)of the pump unit is greased, be sure to check any dust.
GrooveRail"PULL"Do not push here.

×
Connecting point(flow path)

Replacement of Flow Sensor
After the flow sensor is replaced, the operation must be checked by a qualified service engineer.
For the stable operation of the flow sensor and safety, ask a qualified service engineer to take care of
replacement of the parts that operation must be checked. Please contact RIKEN KEIKI.

93

8. Storage, Relocation and Disposal

8-1. Procedures to store the detector or leave it for a long time

88.

Storage, Relocation and
Disposal

8-1. Procedures to store the detector or leave it for along time
The power supply unit must be stored under the following environmental conditions.

In a dark place under the normal temperature and humidity away from direct sunlightIn a place where gases, solvents or vapors are not present

8-2. Procedures to relocate the detector or use it
again
When the power supply unit is relocated, select a new place in accordance with "4-2. Precautions for
installation sites" and "4-4. How to install".
For information on wiring and tubing, see "4-5. How to wire" and "4-6. How to tube". The unpowered timemust be minimized when the detector is relocated.

CAUTION
When using a relocated or stopped/stored alarm system again, never fail to perform calibration. For
information on readjustment including calibration, please contact RIKEN KEIKI.

8-3. Disposal of products Be sure to return a used sensor unit to our company, corporate sales division.
 Be careful of the appearance which cannot touch solution directly, and sure to put into a plastic bag,and in a constant potential electrolysis type sensor unit (ESU) and a Galvany battery-operated-powered
sensor unit (OSU), if the solution leak should be carried out, solution should not leak outside. Whenliquid spills from sensors has occurred in the detection part, please turn 'OFF' a power, and inform
corporate sales division immediately.
 Since a radioactive substance(37kBq) are contained, a heat particle-ized type sensor unit (SSU-1925)
needs to carry out suitable transportation (L form packages equivalents). In returning, please request
the manufacturer who can treat Type L package.
 Although a heat particle-ized type sensor unit (SSU-1927) is contains radioactive material, it is below
10kBq that is determined by IAEA (radiation safe level). So the sensor unit is capable of handling as a
general transport product and waste.
 In case you discard a detection part main part, please carry out suitable processing according toregional law etc. as waste (incombustibles).
94

8. Storage, Relocation and Disposal

8-3. Disposal of products When disposing of the gas detector(ESU sensor unit only) in EU member states, sort the batteries as
specified. Handle the removed batteries according to the classified refuse collection system andrecycling system based on the regulations of EU member states.

Constant potential electrolysis type sensor unit (ESU) internal battery
Model
LR6T(JE)

Type
Alkaline dry battery

WARNING Since electrolyte is contained in the constant potential electrolysis type sensor unit (ESU) and
the Galvanic battery-operated-powered sensor unit (OSU), Please do not decompose by anymeans. When electrolyte is touched, there is a possibility of becoming blind if there is apossibility that the skin may fester and it goes into an eye. Moreover, when it adheres toclothing, it discolors or there is a possibility that a hole may open. When electrolyte is touched,please wash the portion which touched sufficient with water immediately.
 Please be sure to return a heat particle-ized type sensor unit (SSU) to our company according
to the 'safety manual.' I do abandonment disposal suitable by our company. When I do not havea 'safety manual' observed, it will be punished legally.

NOTE The gas detector contains batteries.
 Crossed-out recycle dustbin markThis symbol mark is indicated on the products which contain the batteries which fall under EU Battery
Directive 2006/66/EC. Such batteries need to be disposed of as specified by the latest Directive.
This symbol mark indicates that the batteries need to be separated from the ordinary waste anddisposed of appropriately.

95

9. Troubleshooting

9
9.

Troubleshooting

The Troubleshooting does not explain the causes of all the malfunctions which occur on the detector. This
simply helps to find the causes of malfunctions which frequently occur. If the detector shows a symptom
which is not explained in this manual, or still has malfunctions even though remedial actions are taken,
please contact RIKEN KEIKI.

NOTE
To use the pyrolyzer unit (PLU-70), see also the separate operating manual.
●: Lamp on○: Lamp off<Abnormalities on Unit>
Symptom/Display
The power cannot
be turned on.

FAULT
－

Abnormaloperations○

Incorrect flow rate
indicator(Specified Value
Display does notcorrespond to 0.5
L/min.)○

CausesThe power switch
is turned off.
Abnormalities/mom
entary blackout of
power supply
system
Improperinstallation of themain unit
Cable
abnormalities(open circuit/not
connected/shortcircuit)Disturbances bysudden surge
noise, etc.
Improper flow ratedefault set

96

Actions
Turn ON the power switch.
Provide the rated voltage.
Take measures such as checking or adding the UPS,
power supply line filter and insulation transformer.
Check whether the main unit is properly attached to thewall-mounted unit.
Check the wiring of the detector and related devices
around it.

Turn off and restart the detector.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.
Seemingly performed an improper default set, i.e.,
performed a default set of flow rate on the detector
when the flow rate is not 0.5 L/min.
Prepare another flow meter and perform the flow ratedefault set again.
If such a symptom is observed frequently, the flow
sensor is seemingly malfunctioning. Thus, it must
be replaced. Please contact RIKEN KEIKI.

9. Troubleshooting
Symptom/Display
Sensor unit
abnormalities
E-1 SENSOR

Flow rate warning
FLOW

FAULT
●

○

CausesThe unit is notconnected or
improperly
connected.
Errors incommunication
with the unit
Zero drift causedby environmental
changes or aging
deterioration is outof the range of zero
follower.
Faults of the unit
itselfActions
Check that the sensor unit is connected and theconnectors of the unit are securely fastened.

Unstable flowcaused bydeteriorated
performance of thepump
Unstable flowcaused by clogged
dust filter
Unstable flowcaused by bended
or clogged suction
tube or exhaust
tube
Pressure difference
is present in thesampling condition.
(The flow rate is
ensured eventhough the pumpdrive level is low.)

Seemingly the pump is worn out and its performance isdeteriorated. Although gas detection can be performed
under this condition, the pump unit must be replaced assoon as possible.

Abnormalities arefound in regular
maintenance of theflow sensor.

97

Replace the sensor unit with a new one.
Perform zero adjustment. If the symptom persists after
the zero adjustment, replace the sensor unit with a newone.

Check the sensor unit and replace it with a new one.
If it is apparently damaged, do not touch it with barehands and handle it carefully.

Replace the dust filter.
Fix the defective parts.

In some sampling conditions (presence of pressure
difference between IN and OUT), the flow rate is
ensured even though the pump drive level is low.
Although the detector can be used in such a situation,
the diagnosis function of its pump drive level issues thismessage. The message can be eliminated by disabling
this function. (See “7-2. Regular maintenance mode”)
Check the operating conditions before taking actions.
* If the flow rate indicator is incorrect, the message may
be displayed even though pressure difference is notpresent.
Seemingly the performance of the flow sensor isdeteriorated.
In this case, the flow rate may not be in the range of 0.5
L/min ±10% even though the flow rate indicator
indicates the specified value.
Although gas can be detected provided that flow loss
(fault alarm) does not occur, the flow sensor must be
replaced to fix the symptom. Please contact RIKEN
KEIKI.

9. Troubleshooting
Symptom/Display
Flow rateabnormalities
E-5 FLOW

FAULT●

CausesProtective rubber
cap is not removed.
Broken pump
Flow loss causedby clogged dust
filterFlow loss causedby bended or
clogged suction
tube or exhausttube
The flow sensor is
disconnected or
improperly
connected
Communication
cable abnormalities
Disturbance by
external noise

Communication
abnormalities
E-6(NT/EA/LN
specification)
Clockabnormalities
E-9

○

○

Abnormalities of
the clock inside thedetector

Systemabnormalities
E-9 SYSTEM●

The rated voltage
is not supplied tothe detector.
Abnormalities ofROM, RAM or
EEPROM inside ofthe detector

Actions
Remove the protective rubber cap from GAS IN andGAS OUT.
Replace the pump unit.
Replace the dust filter.
Fix the defective parts.

Please contact RIKEN KEIKI.

Check the wiring of the detector and related devices
around it.
Turn off and restart the detector.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.
Make a setting of Date/Time. Note that when thesensitivity correction function of ESU is used, correction
may not be made properly.
If such a symptom is observed repeatedly, the built-in
clock is seemingly malfunctioning. Thus, it must be
replaced. Please contact RIKEN KEIKI.
Check the power supply, and supply the rated voltage.
Please contact RIKEN KEIKI.

<Abnormalities of Readings>
Symptoms
The reading rises (drops)
and it remains so.

CausesDrifting of sensor
outputPresence ofinterference gas

Actions
Perform the zero adjustment (air calibration).
Disturbances by interference gases, such as solvents,
cannot be eliminated completely. For information on
actions, such as removal filter, please contact RIKEN
KEIKI.
A very small amount of the gas to be detected may beleaking (slow leak). Because ignoring it may cause
dangers, take a remedial measure, i.e., taking actions
the same as those for the gas alarm.
Perform the zero adjustment (air calibration).
In particular, the galvanic cell type is affected by the airpressure.

Slow leakEnvironmental
changes98

9. Troubleshooting
Symptoms
A gas alarm is triggered
despite of no gas leakand no otherabnormalities at thedetection point.

CausesPresence ofinterference gas
Disturbance by noise
Sudden change inthe environment

Slow response

Span adjustment
impossible

Clogged dust filter
Bended or clogged
suction tube or
exhaust tube
Condensation isformed inside thesuction tube.
Deteriorated sensor
sensitivity
Improper calibration
gas concentration
Deteriorated sensor
sensitivity

99

Actions
Disturbances by interference gases, such as solvents,
cannot be eliminated completely. For information on
actions, such as removal filter, please contact RIKEN
KEIKI.
Turn off and restart the detector.
If such a symptom is observed frequently, takeappropriate measures to eliminate the noise.
When the environment (temperature, etc.) changes
suddenly, the alarm system cannot adjust to it and isaffected by it. In some cases, the alarm system triggers
an indication alarm.
Because the alarm system cannot be used undersudden and frequent environmental changes, you musttake any preventive actions to eliminate them.
Replace the dust filter.
Fix the defective parts.

Fix the defective parts.
Replace the sensor unit with a new one.
Use the proper calibration gas.
Replace the sensor unit with a new one.

10. Product Specifications

10-1. List of specifications

10
10.

Product Specifications

10-1. List of specifications<Common Specifications>Concentration display
Flow rate
Power display
Displays
Gas alarm display
Gas alarm activation
Gas alarm contact
Fault alarm/selfdiagnostic
Fault alarm display
Fault alarm activation
Fault alarm contact
Contact capacity
Contact cable
Functions
Tube connecting port
Initial clear
Structure
External dimensions

WeightOuter color

Character LCD (Digital and Bar Meter Display)
0.5 L/min ±10%
POWER lamp on (green)
Gas name display/flow rate indicator/mode display/communication status
display/pyrolyzer connection display
First: ALM1 lamp on (Red)/Second: ALM2 lamp on (Red)Non latching (auto-reset) or self-latching
No-voltage contact 1a or 1b (2 step independent)
De-energized (energized at an alarm state) or energized (de-energized at an alarmstate)
System abnormalities/sensor abnormalities/flow rate abnormalities/ communication
abnormalities/pyrolyzer abnormalities
FAULT lamp on (yellow)/detail display
Non latching (auto-reset)
No-voltage contact 1a or 1b
De-energized (energized at an alarm) or energized (de-energized at an alarm)
24 VDC, 0.5 A (resistance load)【4 - 20 mA / NT / EA / LN specification】: Cable of CVV, etc. (1.25 mm2) - max. 6-core【DV specification】: Cable of CVV, etc. (1.25 mm2) - max. 4-core
White backlight/alarm delay/suppression/zero follower/sensitivity correction/
flow control/Calibration history/alarm trend history/event history
Rc1/4 (O.D Φ 6-1t polytetrafluoroethylene (PTFE) tubing, with half-union <PP> forthe tubing)Approx. 25 seconds
Box type/Wall mounted type
【4 - 20 mA / NT / EA / LN specification】:
Approx. 70 (W) x 120 (H) x 145(D) mm (projection portions excluded)【DV specification】:
Approx. 78 (W) x 210 (H) x 184 (D) mm (projection portions excluded)【4 - 20 mA / NT / EA /LN specification】: Approx. 0.9 kg【DV specification】: Approx. 1.7 kg
Detector: Grey
Front door: White100

10. Product Specifications

10-1. List of specifications<Specifications for Each Model>
ModelTransmission
methodTransmission
specifications
Transmission
Cable
Power supply
Cable
Power supply

Model
Transmission
methodTransmission
specifications

GD-70D
3-wire type analog transmission(Common cable for power and signal<Power, Signal, Common>)or 2-wire type analog transmission
4 - 20 mA DC(no-insulation/load resistance under 300 Ω)
Shielded cable of CVVS, etc.
(1.25 mm2) 3-core or 2-core
Cable of CVV, etc. (1.25mm2) - 2-core(3-wire analog transmission is common
with the transmission cable.)
24 VDC±10%

GD-70D-NT
2-wire type DC power-line communication

GD-70D-EA
Digital transmission: Ethernet(10BASE-T/100BASE-TX)
Analog transmission:
3-wire type analog transmission(Common cable for power and signal<Power, Signal, Common>)or 2-wire type analog transmission
Digital transmission: Ethernet
Analog transmission: 4 - 20 mA DC (noinsulation/load resistance under 300 Ω)

GD-70D-DV
Communication protocol: DeviceNet
compliantTransmission
cable

Digital transmission: Ethernet cable(category 5 or higher)
Analog transmission: Shielded cable of
CVVS, etc. (1.25 mm2) - 3-core or 2-core

Power supply
cable

Cable of CVV, etc. (1.25mm2) - 2-core(common with the digital transmission
cable when PoE connection isused/common with the analog transmission
cable when 3-wire analog connection isused)
24 VDC ±10% or PoE connection

Power supply
Model
Transmission
methodTransmission
specifications
Transmission
cablePower supply
cablePower supply

GD-70D-LN
LONWORKS (LN)
LONWORKS
Shielded twisted pair cable of KPEV-S, etc.
(1.25 mm2) ・1P
Cable of CVV, etc. (1.25 mm2) - 2-core
24 VDC ±10%101

Shielded twisted-pair cable of KPEV-S, etc.
(1.25 mm2) - 1P
(Common with the transmission cable)
24 VDC±10%(Dedicated line by blocking filter)

Connection type:Combination of multi-drop method and Tjunction method is possible
Communication speed: 500/250/125 kbps
(auto-detect)
Dedicated DeviceNet cable
500 m (125 kbps) branch line length 6 m orless, total branch line length 156 m or less
125 m (250 kbps) branch line length 6 m orless, total branch line length 78 m or less
100 m (500 kbps) branch line length 6 m orless, total branch line length 39 m or less
* The above figures apply when a thickcable is used for the trunk line. When a thincable is used, the length will be 100 m or
less.
Cable of CVVS, etc. (1.25 mm2) - 2-core orequivalent

24 VDC±10%10. Product Specifications

10-1. List of specifications<Specifications for Each Principle>
ESU
Detection
principle
Gas to be
detected
Detection range
Detection method
Alarm setpointvalue

ESU + PLU *1
Electrochemical type

Toxic gas *2
Depending on the gas tobe detected
Pump suction type
Depending on the gas tobe detected

NF3:
10 ppm (1st)/20 ppm (2nd)COS:
30 ppm (1st)/60 ppm (2nd)

60 seconds or less *4(under the same
conditions)

Alarm typeTwo-step alarm(H-HH)

Power
consumption
Power
consumption (EA)
Power
consumption(DV)Operatingtemperature(at a constantcondition)
Operatinghumidities(Non-condensing)

Alarm delay time
(under the same
conditions)

Alarm typePower
consumption
Power
consumption (EA)

Depending on the gas to be
detected

Within ±30% *3

Alarm delay time

(under the same
conditions)

Toxic gas *2

NF3: 0 - 30 ppm
Depending on the gas to be
COS: 0 - 90 ppm
detected
Pump suction type/pyrolysis type(under the same
conditions)

Detection method
Alarm setpoint
value
Alarm accuracy

Pyrolysis-particle type

NF3/COS

Alarm accuracy

Detection
principle
Gas to be
detected
Detection range

SSU + PLU *1

Approx. 1.5 W (Max. 4 W)
24 V: Approx. 3W (Max. approx. 5W)
PoE: Approx. 4.5W (Max. approx. 7W)
Approx. 2 W (Max. 4.5 W)
0 - 40ºC

30 - 70%RH

30 - 80%RH

NCU

SGU

OSU *5

New ceramic

Semiconductor

Galvanic cell typeCombustible gas
Toxic gas
Depending on the gas to Depending on the gas to be
be detected
detected
Pump suction type
Depending on the gas to Depending on the gas to be
be detected
detected
Combustible: within ±25%
Within ±25% *3*3
Toxic: within ±30% *3
Combustible: 30 seconds
or less *4
30 seconds or less *4
Toxic: 60 seconds or less*4
Two-step alarm(H-HH)
Combustible gas

Approx. 3W (Max. 5.5W)
24 V: Approx. 4.5W
(Max. approx. 6.5W)
PoE: Approx. 5.5W
(Max. approx. 8.5W)

Approx. 2.5W (Max. 5W)
24 V: Approx. 4W(Max. approx. 6W)
PoE: Approx. 5.5W
(Max. approx. 7W)

102

Oxygen0 - 25 vol%18 vol% (1st)18 vol% (2nd)Within ±1 vol%(Accuracy of the reading:
within ±0.7 vol%)5 seconds or less *6(90% response: within 30
seconds)
Two-step alarm(L-LL, L-H)
Approx. 1.5 W (Max. 4 W)
24 V: Approx. 3W(Max. approx. 5W)
PoE: Approx. 4.5W
(Max. approx. 7W)

10. Product Specifications

10-1. List of specifications

Power
Approx. 3.5W (Max. 6W)
Approx. 3W (Max. 5.5W)
Approx. 2 W (Max. 4.5 W)
consumption(DV)Operatingtemperature
0 - 40ºC(at a constantcondition)
Operatinghumidities
95%RH or less(Non-condensing)*1 Pyrolyzer unit combination specification. For information on the specifications of thepyrolyzer unit (PLU-70), see the separate operating manual.
*2 The operating temperature/humidity may be different depending on the gas to be
detected.
*3 To the alarm setpoint value*4 By providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in
the communication)*5 Oxygen deficiency specification*6 By letting the detector detect the gas of 10 - 11 vol% (excluding delay in the tube andin the communication).

NOTE
For information on other specifications such as oxygen leak specifications (OSU), please contact RIKEN
KEIKI.

Detection
principle
Gas to be
detected
Detection range
Detection method
Alarm setpoint
value
Alarm accuracy*1(under the same
conditions)

Alarm delay
time*2(under the same
conditions)

Alarm typePower
consumption
Power
consumption (EA)

IRU
NDIR
(Non-Dispersive Infrared
Absorption)

SHU
Hot-wire Semiconductor

N2O

H2

0 - 500 ppm
0 - 2000 ppm
Pump suction type
50 ppm (1st)500 ppm (1st)
100 ppm (2nd)1000 ppm (2nd)Within ±30%

Within ±25%

30 seconds or less

30 seconds or lessTwo-step alarm(H-HH)

Two-step alarm(H-HH)

Approx. 3 W (Max. 5 W)

Approx. 3 W (Max. 5 W)

24 V: Approx. 4.5W
(Max. approx. 6.5W)
PoE: Approx. 5.5W
(Max. approx. 8W)

24 V: Approx. 4.5W
(Max. approx. 6.5W)
PoE: Approx. 5.5W
(Max. approx. 8.5W)

Power
Approx. 3.5 W (Max. 5.5 W)
Approx. 3.5 W (Max. 5.5 W)
consumption(DV)Operatingtemperature
0 - 40ºC(at a constantcondition)
Operatinghumidities
95%RH or less(Non-condensing)*1 To the alarm setpoint value*2 By providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in
the communication)

10310. Product Specifications

10-2. List of accessories

10-2. List of accessories







Operating manualProtective rubber cap
Dedicated handling lever
Dust filter
Interference gas removal filter(to be supplied with sensor units for certain gases)
External connector for 5-pin communication (for DV specification only)

10-3. Detection principle<Electrochemical Type>The electric potential between the working electrode and reference electrode is kept at a certain level by apotentiostat circuit.
The gas to be detected is electrolyzed directly at the working electrode. Because the electric current
generated there is proportional to the gas concentration, the gas concentration can be known bymeasuring the electric current flown between the working electrode and the opposite electrode.
ポテンショスタット回路
Potentiostat circuit

Gas permeable membrane
気体透過膜
Gas inGasin

R (resistance)
Ｒ（抵抗）Electrolyte
電解液

Gas out
Gas

参照電極
Reference electrode

Oppositeelectrode
対極作用電極
Working
electrode

Structure diagram

構造図

104

10. Product Specifications

10-3. Detection principle

Special precautions for this principle
1.

The detector may be interfered by gases other than the gas to be detected, solvents, vapors, etc.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint (threshold limit value) may trigger a false alarm.

3.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

4.

Because the contact point of the gas detector sensor is made of porous polymeric membrane, thewater repellency of the membrane is deteriorated by solvents, thus causing an electrolyte leak fromits inside.
Do not use solvents near the detector. If a solvent is used for unavoidable reasons, attach therecommended filter to the areas such as inlet of the gas detector while using the solvent and for one
hour after that.

5.

For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and a calibration are
performed every six months in accordance with the regulations.

<Pyrolysis-Particle Type>
When the gas to be detected is heated to several hundred degrees, particulate solid oxides are formed.
This is a sensor to detect particles formed in such a way by using the α ray absorbing method.
[Pyrolyzer]【熱分解器】
Heater
加熱ヒータ

Insulation
断熱材

ガス
Gas
石英管 pipe
Quartz[Particle
Detector]【粒子検出器】
Samplegas
サンプルガスMeasurementcell
測定室
絶縁物 material
Insulating

Aｍ－241

V+

Ａ

Output
出力

VAｍ－241

Compensation
補償室box

高入力インピーダンス
Highinput impedance
集電極 amplifier
増幅器
Collector
electrode

Structure
This unit consists of a pyrolyzer which heats gas to several
hundred degrees and a particle detector which detect
oxides.
The pyrolyzer has a quartz pipe at its center covered with aheating element and a heat insulator around it.
The particle detector consists of the measurement cell inwhich α ray always generates ion current and thecompensation cell which has the identical structure (gas is
not introduced).
Principle
When most of organic metal (MO) gas, such as TEOS, areheated, particulate oxides are formed. Sample gas which isdecomposed to oxides in the Pyrolyzer is introduced into theparticle detector.
Inside of the measurement cell of the particle detector, the α
ray radiation source*1 ionizes the air and generates ion
current.
Ion current is also generated in the compensation cell, andits ratio is maintained at a certain level in both themeasurement cell and the compensation cell when no gas ispresent.
When particles are introduced into the measurement cell,
the particles adsorb ions, thus reducing the ion current. Its
ratio to the compensation cell changes, which can beobtained from the detector.
*1 SSU-1925/SSU-1925A: Am-241 37 kBq
SSU-1927:Am-241 7.4 kBq
105

10. Product Specifications

10-3. Detection principle

Special precautions for this principle
1.

This detector may be interfered by gases other than the gas to be detected and vapors.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint may trigger a false alarm.

3.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

4.

The gas detection sensor unit (SSU-1925/SSU-1925A) attached to the detector contains a small
amount of radioactive materials. Do not disassemble it, or dispose of it like other wastes. (Forinformation on how to handle the sensor, see the “Safety Manual”.)

5.

Although the gas detection sensor unit (SSU-1927) is contains radioactive material, it is below 10kBq
that is determined by IAEA (radiation safe level). So the sensor unit is capable of handling as a
general transport product and waste.

6.

For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and a calibration are
performed every six months in accordance with the regulations.

The detector has the pyrolysis-particle type sensor, which is a radioisotope-equipped unit. It is examinedin accordance with the regulations on “Article 12 - 3 of Act on Prevention of Radiation Disease Due toRadioisotopes, etc.” (Nuclear Safety Technology Center, a certification and registration body), and certified
as a specified designing certification device, which is regarded as a unit causing little radiation damage.
(SSU-1925 Certificate Number:
091, SSU-1925A Certificate Number:
207)
No registrations have to be made to use a gas detector with the pyrolysis-particle type sensor installed (asfar as it is used in accordance with this operating manual).
When the pyrolysis-particle type sensor is used as a single unit, observe the certification conditions
specified in the “Safety Manual”.

10610. Product Specifications

10-3. Detection principle[SSU-1925]<Safety Manual>

No.4019 4059 2

The pyrolysis-particle type sensor (SS-1923/1924 and SS-1925 Note1)) is a radioisotope-equipped
device which uses radioisotope 37 kBq 241-Am.
This pyrolysis-particle type sensor is certified as a specified designing certification device by Nuclear
Safety Technology Center, a certification and registration body causing little radiation damage. (SS1923/1924 : Certificate Number 027, SS-1925 : Certificate Number 091)
When the sensor is used within Japan, no registrations have to be made Note2).
However, because the regulations are applied to the sensor, it must be used in accordance with thefollowing certification conditions Note3).







Do not disassemble the sensor Note4).
The sensor must be installed in our product when it is used. Do not remove it from the product if notnecessary.
When the sensor is detached from the product and is stored, you must introduce measures toprevent it from being taken out freely, i.e., putting it into the dedicated box we specify, and keeping
it in a locked room.
When the sensor is no longer needed, do not dispose of it, but return it to us.
The sensor must be handled as a L-type package. It must be put into the dedicated box we specify
or integrated into our product which is labeled as a "Radioactive L-type package" when it istransported.
When the sensor is transported, it must be handled by a transportation company which can handle
L-type packages Note5).

Note 1)
Note 2)
Note 3)Note 4)Note 5)

SS-1925 indicates the sensor installed in the pyrolysis-particle type sensor unit SSU1925.
When the sensor is used outside of Japan, observe the regulations of the respective
country.
When the sensor is used in a way not in accordance with the certification conditions, ausage registration must be made to the Nuclear Regulation Authority.
If you find the sensor which is not controlled properly, please let us know.
Do not disassemble the pyrolysis-particle type sensor unit SSU-1925 in which SS-1925
is installed.
L-type packages can be handled by us and service companies we specify.
Web site on the designing certification: http://www.nsr.go.jp/
2-7-6 Azusawa Itabashi-ku Tokyo, 174-8744 JapanTEL 03-3966-1111
RIKEN KEIKI CO., LTD.

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10. Product Specifications

10-3. Detection principle[SSU-1925A]<Safety Manual>

No.4019 4081 1

The pyrolysis-particle type sensor (SS-1925A) Note1) is a radioisotope-equipped device which uses
radioisotope 37 kBq.
This pyrolysis-particle type sensor is certified as a specified designing certification device by Nuclear
Safety Technology Center, a certification and registration body causing little radiation damage. (SS1925A : Certificate Number 027)
When the detector is used within Japan, no registrations have to be made. Note2)
However, because the regulations are applied to the sensor, it must be used in accordance with thefollowing certification conditions. Note3)<Conditions of use>The sensor shall not be disassembled because of its function to prevent radiation damage. Note4)
The sensor must be installed in our product when it is used. Do not remove it from the product if notnecessary.
<Conditions of storage>
Store in dedicated containers designated by the Company with the label "Radioactive L-type
package."
In a lockable room, the radioisotope-equipped equipment concerned shall be kept locked in the room
during storage so that it cannot be taken away without permission during storage.
When the sensor is no longer needed, do not dispose of it, but return it to us.

Dedicated container

10810. Product Specifications

10-3. Detection principle

No.4019 4081 1<Conditions of transport>When the sensor is transported, it must be handled by a transportation company which canhandle L-type packages. Note5)
When transporting, make sure that there is no damage to the container, which must meet thefollowing conditions and be placed in a container specified by our company.
A)

Equivalent to the L-shaped transported goods specified in Article 18-3, Paragraph 1, Item 1 of
the Regulations.
B) The product shall be easy and safe to handle.
C) There shall be no risk of cracks or breakage due to changes in temperature and internalpressure, vibration, etc. expected during transportation.
D) The surface shall be free of unwanted protrusions and shall be easily cleaned of surface
contamination.
E) There is no risk of hazardous physical action or chemical reaction between the materials andeach other or between the materials and the radioisotope, etc. to be stored or packaged.
F) Measures shall be taken to prevent accidental operation of the valves.
G) The label "Radioactive" and the label "Equivalent to L-Type Transported Material" shall beaffixed in a conspicuous position. In addition, a similar marking shall be placed in an easily
visible position when the special container is opened.
H) The 1-centimeter dose equivalent rate on the surface of the dedicated container shall not
exceed 5 microsieverts per hour.
I) The density of radioisotopes on the surface of the dedicated container does not exceed thesurface density of the transported material specified in Article 18-4-8 of the Regulations.
J) Documents and other articles necessary for the use of radioisotopes, etc. (limited to those thatare not likely to impair the safety of radioactively transported materials) (2) Nothing other than
the following shall be stored or packaged.

When transporting, please also pay attention to the Regulations on Vehicle Transportation ofRadioisotopes, etc.
Note 1)
Note 2)
Note 3)Note 4)Note 5)

SS-1925A indicates the sensor installed in the pyrolysis-particle type sensor unit
SSU-1925A.
When the sensor is used outside of Japan, observe the regulations of therespective country.
When the sensor is used in a way not in accordance with the certification
conditions, a usage registration must be made to the Nuclear Regulation Authority.
If you find the sensor which is not controlled properly, please let us know.
Do not disassemble the pyrolysis-particle type sensor unit SSU-1925A in which
SS-1925A is installed.
L-type packages can be handled by us.
Web site on the designing certification: http://www.nsr.go.jp/
2-7-6 Azusawa Itabashi-ku Tokyo, 174-8744 JapanTEL 03-3966-1111
RIKEN KEIKI CO., LTD.

109

10. Product Specifications

10-3. Detection principle

Safety of the radioisotope 241Am (37 KBq) used in the pyrolysis-particle
type sensor (SSU-1925/SSU-1925A)
The pyrolysis-particle type sensor installed in the gas detector uses the radioisotope 241Am radiation
source (18.5 KBq x 2 = 37 KBq).
A specified designing certification device must satisfy the specified threshold for “1 cm dose equivalent
rate at a point 10 cm away from the surface of the device” as a certificate condition, which is the following
value (tolerable amount).
Tolerable amount
1 cm dose equivalent rate at apoint 10 cm away from thesurface of the device

1μSv･h-1

The detector which uses radioisotope 241Am radiation source (18.5 KBq x 2 = 37 KBq) has the following 1
cm dose equivalent rate at a point 10 cm away from its surface, meaning that it completely satisfies thecertification condition.
1 cm dose equivalent rate at a point 10 cm away from the surface of thesensor (calculated value)
3

D

Q
1cm

r

2  18.5  10Q
 0.00524  0.019 [μSv･h-1] 1cm 
2
2
r
0.1
: Amount of radioisotope 2 x 18.5 x 10-3 [MBq] =(37 KBq)
: 1 cm dose equivalent rate constant of 241Am 0.00524 [μSv･m2･MBq-1･h-1]*Adapted from Isotope handbook, 12th Edition.
: Distance from radiation source 0.1 [m]It is certified as a safety unit, provided that it is used in accordance with the certification conditions
specified in the “Safety Manual”.

11010. Product Specifications

10-3. Detection principle<New Ceramic Type>
When a combustible gas burns on the surface of a highly active new ceramic oxidation catalyst in catalytic
combustion, the new ceramic-type sensor measures resultant temperature changes by measuring theresistance changes in the heat-resistant alloy wire coil.
The sensor consists of two elements: A detecting element having a heat-resistant alloy wire coil with anultrafine particle (new ceramic) oxidation catalyst sintered on it together with a carrier and a temperaturecompensating element with a mixture of gas-inert alumina and glass sintered on it.
When a combustible gas comes into contact with the surface of the detecting element with new ceramicoxidation catalyst sintered on it, the gas burns, causing the temperature to rise. In accordance with thistemperature change, there occurs a change in the resistance of a heat-resistant alloy wire coil that
constitutes the element. These resistance values are approximately proportional to gas concentrations.
From the changes in the resistance values, potential differences are obtained using a bridge circuit anddisplayed as gas concentrations on the meter.
ＡＡ

C: Compensating element
C：補償素子

D: Detection element
D：検知素子Heat-resistant alloy
Alumina
アルミナ担体 wire coil
耐熱合金線コイル

Heat-resistant
耐熱材料
material (ceramic)（セラミック）New ceramicoxidation
ニューセラミック
catalyst
酸化触媒

ＸＸ

Ｙ

固定抵抗
Fixed resistance

1.4～1.6mm

1.3～1.8mm

Ｍ

固定抵抗
Fixed resistanceブリッジ
Variable resistor平衡調整可変抵抗器
for bridge equilibrium adjustment

SW

Structure
diagram
構造図

VR

E

スイッチ Power
Switch電源
ブリッジ電圧Variable
resistor for
調整可変抵抗器
bridgevoltageadjustment

Basiccircuit
基本回路

Special precautions for this principle
1.

This detector may be interfered by gases other than the gas to be detected and vapors.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint may trigger a false alarm.

3.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

4.

The gas sensing part of the gas detection sensor installed in this detector is made of metal porous
sintered alloy permeated with an oxidation catalyst. If silicon or sulfide compounds are accumulatedon the surface of porous sintered alloy, the area of the gas sensing part becomes smaller, which may
result in serious deterioration of its sensitivity.
For safety reasons, do not use the detector under the presence of silicon or sulfide compounds eventhough their amount is very small.

5.

For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual.
In addition, because this is a safety unit, it is recommended that a regular maintenance and acalibration are performed every six months in accordance with the regulations.

111

10. Product Specifications

10-3. Detection principle<Semiconductor Type>
Metal dioxide can measure gas concentration based on changes in the electric conductivity ofsemiconductor caused by gas adsorbed on its surface.

VH

Vs

RL

Vo

RL: Load resistance, Vo: Output voltage
VH: Heater voltage, Vs: Sensor voltage

Special precautions for this principle
1.

This detector may be interfered by gases other than the gas to be detected and vapors.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint may trigger a false alarm.

3.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

4.

The gas sensing part of the gas detection sensor installed in the detector is made of porous sinteredalloy. If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, thearea of the gas sensing part becomes smaller, which may result in serious deterioration of its
sensitivity.
For safety reasons, do not use the detector under the presence of silicon or sulfide compounds eventhough their amount is very small.

5.

For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and a calibration are
performed every six months in accordance with the regulations.

112

10. Product Specifications

10-3. Detection principle<Galvanic Cell Type>By immersing precious metal and lead in electrolyte and connecting them with a lead wire, a battery canbe made (galvanic cell). When oxygen passes through the barrier, deoxidizing reaction occurs at the
precious metal electrode while oxidizing reaction occurs at the lead electrode.
The electric current generated by this reaction goes through load resistance (thermister), where it isconverted into voltage so that it can be read. When the oxygen concentration is decreased, deoxidizing
reaction at the precious metal electrode is also decreased, thus lowering the voltage at both ends of thethermister.
Barrier
隔膜

Negative electrode
陰極Electrolyte
電解液

Positive electrode陽極

Output terminal
出力端子
Thermister
サーミスタ

Structure diagram

構造図

Special precautions for this principle
1.

The readings of the detector fluctuate slightly in response to changes in the air pressure. In particular,
be careful of alarm activation when a low air pressure is brought in by typhoon. In addition, it may befluctuated by environmental (temperature, humidity, etc.) changes in the installation site.

2.

The alarm must be set within a range where the performance of the detector can be ensured. The
standard alarm setpoint value is 18 vol%.

3.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

4.

For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and span adjustment are
performed every six months.

113

10. Product Specifications

10-3. Detection principle<NDIR(Non-Dispersive Infrared Absorption) Type>IR light enters the cell and gas absorbs the beam, so the absorption rate and the gas concentration willcorrelate. The IR detector detects the IR light and will put it out as gas concentration.
The band pass filter only lets specific wavelength that is absorbed by the target gas. The detector will notdetect any light that has different wavelength. Also, the detector will not detect gas that does not absorb IR
rays.
Gas INGas OUTIR

IR sourceBand pass filter

Gas cellIR sensor

Concentration indicator

Special precautions for this principle
1.

The alarm must be set within a range where the performance of the detector can be ensured.
The standard alarm setpoint value are 50ppm(1st), 100ppm(2nd).

2.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

3.

For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and span adjustment are
performed every six months.

114

10. Product Specifications

10-3. Detection principle<Hot-wire Semiconductor>
The hot-wire semiconductor type sensor detects a change in resistance of the platinum wire coil integrated
in a metal oxide semiconductor whose resistance value changes by contact with a gas as gas concentration.
This is a highly sensitive gas detection sensor suitable for low concentrations.
D: Detecting element

Metal oxide sintered alloy

C: Compensating
element

Platinum wire coil

0.4 - 0.8 mm
Fixedresistance

0.5 - 1.0 mm

Structure Diagram

Fixed
resistance

Variable resistor for bridge
equilibrium adjustment

Variable resistor for bridge
voltage adjustment

SwitchPower supply

Basic Circuit

Special precautions for this principle
6.

This detector may be interfered by gases other than the gas to be detected and vapors.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated byenvironmental (temperature, humidity, etc.) changes in the installation site.

7.

The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard
alarm setpoint may trigger a false alarm.

8.

This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while theanalog signal output must be used for an indicator or external recorder. If these outputs are used tocontrol other units, we shall not be responsible for any malfunctions.

9.

The gas sensing part of the gas detection sensor installed in the detector is made of porous sinteredalloy. If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, thearea of the gas sensing part becomes smaller, which may result in serious deterioration of its
sensitivity.
For safety reasons, do not use the detector under the presence of silicon or sulfide compounds eventhough their amount is very small.

10. For maintenance of the detector, it must go through a regular maintenance, including replacement
and adjustment of the regular replacement parts as specified in the operating manual. In addition,
because this is a safety unit, it is recommended that a regular maintenance and a calibration are
performed every six months in accordance with the regulations.

115

11. Definition of Terms

11
11.

Definition of Terms

External dust filter
vol%
ppm
ppb
Calibration
Maintenance mode

Initial clear
Zero suppression
Alarm delay time
InhibitPyrolyzer Unit
DeviceNet

When the detector is used in a dusty environment, it is recommended that adust filter should be attached to its outside. The filter is specified based on thegas to be detected. Please contact RIKEN KEIKI.
Gas concentration indicated in the unit of one-hundredth of the volume
Gas concentration indicated in the unit of one-millionth of the volume
Gas concentration indicated in the unit of one-billionth of the volume
Find relationship of the readings, display values or setting values with theactual values by using the calibration gas.
When maintenance is performed on the detector, the alarm contact is
disconnected, and a signal to indicate the maintenance mode status is sent out
to the external output signal. As a result, maintenance can be performed on asingle unit of the monitor.
The reading is unstable for seconds after the power is turned on. To prevent
malfunctions for that period, the alarm contact is deactivated. In addition, asignal to indicate the initial clear status is sent out to the external output.
A function to cut off the influences of environmental changes, interference
gases, etc.
A function which temporarily suspends activation to prevent a false alarm
caused by noise from its outside.
The gas detection function is temporarily suspended during maintenance etc.
of the detector.
This is also called "point skip", which has the same function.
A unit to decompose gases under high temperatures. It pyrolyzes special gases
under high temperature to make them detectable.
DeviceNet is a set of standardized (open) device control network specifications
for factory automation.
DeviceNet supports communication between devices from different
manufacturers supporting DeviceNet as well as data exchange with equivalentdevices from other manufacturers.

116